IVF Pregnancy Due Date Calculator

FET stands for Frozen Embryo Transfer. It is a procedure in assisted reproductive technology where a previously cryopreserved embryo from an earlier IVF (In Vitro Fertilisation) cycle is thawed and transferred into a woman’s uterus. This method allows individuals or couples to utilise embryos that were not used during a prior cycle, offering additional opportunities for pregnancy without the need to undergo another full IVF process.

Frozen Embryo Transfer has become increasingly popular due to its convenience and high success rates, which are comparable to fresh embryo transfers. The procedure involves carefully preparing the uterine lining to ensure optimal conditions for implantation. FET provides flexibility in family planning and can reduce the physical and financial burdens associated with multiple IVF cycles, making it a favourable option for many undergoing fertility treatments.

London Pregnancy Clinic is a one-stop service for all of your pregnancy needs. Our specialists cover all aspects of pregnancy monitoring, starting from scans, obstetric care all the way to GP and midwifery. Many IVF clinics trust us to manage the pregnancies of their patients due to our expertise and experience with such patients.

The accuracy of the Estimated Due Date (EDD) from ultrasound is a pivotal concern in prenatal care, influencing a wide array of clinical decisions and maternal expectations. Ultrasound-based EDD estimation is renowned for its precision, particularly when performed in the first trimester of pregnancy. This period is considered the golden window for EDD estimation through ultrasound due to the uniformity of fetal growth across pregnancies, making early ultrasounds the most reliable method for dating a pregnancy.

First-trimester ultrasounds, typically conducted before 14 weeks of gestation, can predict the due date with an accuracy of +/- 5 to 7 days. The crown-rump length (CRL), which measures the length of the fetus from the top of the head (crown) to the bottom of the buttocks (rump), serves as the cornerstone for this estimation. Due to the standardised rate of fetal growth during these initial weeks, the CRL provides a precise benchmark for calculating the gestational age and, subsequently, the EDD.

The accuracy of ultrasound-based EDD estimations slightly diminishes as the pregnancy progresses. In the second trimester, the margin of error increases to approximately +/- 7 to 14 days. By the third trimester, variability in fetal growth between pregnancies makes dating least reliable: StatPearls gives an accuracy of roughly ±21 to 30 days.

A due date established in the first trimester should not be revised on the basis of a third-trimester scan.

Despite this gradual decrease in precision, ultrasound remains a crucial tool for EDD estimation throughout pregnancy, offering significant advantages over other methods such as the date of the last menstrual period, especially when the menstrual cycle is irregular or the conception date is uncertain.

Moreover, ultrasound examinations provide additional benefits beyond EDD estimation, including the assessment of fetal growth, detection of congenital anomalies, evaluation of the placenta, and monitoring of the pregnancy’s health. The integration of ultrasound in prenatal care exemplifies its indispensable role in modern obstetrics, facilitating informed clinical decisions, optimising maternal and fetal outcomes, and enhancing the antenatal care experience.

Use our Pregnancy Due Date Calculator to find out your EDD!

Going past your Estimated Due Date (EDD) as determined by ultrasound or Last Menstrual Period (LMP) can be a source of concern for many expectant mothers, but it is a relatively common occurrence. It’s important to understand that the EDD is an estimate, not a guaranteed delivery date. In fact, only about 5% of babies are born on their precise due date. Most babies are born within a week or two before or after the estimated due date, with a significant number arriving safely after this period.

If you have gone past your EDD, it’s crucial not to panic. Here are several reasons why being past your due date is usually not a cause for immediate concern:

However, while it’s often not a cause for immediate concern, ongoing monitoring is essential to ensure the continued health of both the mother and the baby. Healthcare providers typically recommend increased surveillance if a pregnancy extends too far beyond the EDD. This can include:

In some cases, if a pregnancy extends significantly beyond the EDD (usually beyond 41 or 42 weeks, depending on the healthcare provider’s policies and the mother’s health), induction of labour may be suggested. The decision to induce labour is based on the balance between the risks of prolonged pregnancy (such as increased risk for stillbirth, decreased amniotic fluid, and the potential for a larger baby, which can complicate delivery) and the readiness of the baby and the cervix for birth.

It’s essential to maintain open communication with your healthcare provider if your pregnancy goes past your EDD. They can provide guidance, reassurance, and care tailored to your specific situation, ensuring the best outcomes for you and your baby. Remember, the goal is a healthy delivery, and sometimes that means waiting a bit longer for your little one to decide it’s time to make an appearance.

• Variability in Pregnancy Length: Every pregnancy is unique, and the length can vary. The EDD is based on a 40-week gestational period, starting from the first day of the last menstrual period, but this is an average rather than a rule.
• Accuracy of EDD: Both the methods of using LMP and ultrasound have their margins of error. Early ultrasound (in the first trimester) is generally more accurate than LMP for dating a pregnancy, but it’s still an estimate with a margin of error.
• Natural Variation: There is a natural variation in the length of pregnancy. It’s common for pregnancies to extend beyond 40 weeks, and most of these prolonged pregnancies result in healthy deliveries.
• Non-stress tests to monitor the baby’s heart rate and movements.
• Amniotic fluid checks using ultrasound to ensure the baby still has enough amniotic fluid.
• Biophysical profiles, which are more comprehensive exams that assess the baby’s breathing, movement, muscle tone, heart rate, and amniotic fluid levels.

Pre-term birth, classified as the delivery of a baby before the completion of 37 weeks of pregnancy, is a critical concern in the field of obstetrics and neonatal care. Unlike full-term pregnancies, which culminate after 37 to 42 weeks, pre-term births occur when a baby is born prior to the 37th week, marking a significant deviation from the expected gestational period. This early delivery can lead to various health challenges for the newborn, including respiratory issues, digestive problems, and developmental delays, highlighting the importance of specialised care and attention for these infants.

Pre-term birth is further categorised into three subgroups based on the gestational age at birth: extremely pre-term (less than 28 weeks), very pre-term (28 to less than 32 weeks), and moderate to late pre-term (32 to less than 37 weeks). The categorisation helps healthcare professionals in tailoring the care and interventions necessary for the optimal development of pre-term infants, addressing the unique needs based on the degree of prematurity.

The causes of pre-term birth are multifaceted, encompassing a range of factors such as genetic predispositions, maternal health issues (e.g., infections, chronic conditions like diabetes or high blood pressure), lifestyle factors, and complications in pregnancy like preeclampsia or placental problems. Preventive measures and early detection of risk factors play a crucial role in mitigating the incidence of pre-term births, underscoring the importance of comprehensive prenatal care.

Addressing the health challenges associated with pre-term birth requires a multidisciplinary approach, involving obstetricians, neonatologists, paediatricians, and a host of other healthcare specialists. The management and care of pre-term infants are tailored to their specific needs, ranging from respiratory support for those with underdeveloped lungs to specialised nutritional support to promote growth and development.

Pre-term birth remains a leading cause of neonatal mortality and morbidity worldwide, making it a significant public health issue. The ongoing research and advancements in neonatal care continue to improve the outcomes for pre-term infants, emphasising the importance of access to quality prenatal and postnatal care in reducing the prevalence and impact of pre-term births.

Your first scan with the NHS is likely to be the Nuchal Translucency/Dating scan at 11-14 weeks. This scan is predominantly designed to screen for the same chromosomal anomalies as NIPT using an older methodology developed in the 1990s. NIPT is a far more advanced test developed in 2011 with a much higher accuracy.

Most crucially, majority of NHS Trusts have no protocols for structural anomalies screening until ~20 weeks. Our scans are specially designed to screen for every anomaly detectable from an early gestational age and will improve the management of the pregnancy.

Learn more about our 10 week scan. Use our pregnancy due date calculator to get the best possible dates for your scans!

A Viability Scan, also known as an early pregnancy scan, is an ultrasound examination that is usually carried out between 6 to 9 weeks of pregnancy. This scan plays a crucial role in confirming the presence of your baby’s heartbeat, determining the number of babies you’re expecting, and estimating the gestational age of your pregnancy, helping to establish a more accurate due date.

During a Viability Scan, a small ultrasound device called a transducer is either passed over your belly or, more commonly in early pregnancy scans, used internally via the vagina to get a clear view of your womb. The procedure is safe, painless, and non-invasive. The internal scan does not harm the baby or interfere with the pregnancy.

Following a Viability Scan, you should have a clearer understanding of your pregnancy’s health status. Most parents find this early scan a comforting confirmation of their pregnancy’s progression. However, if there are concerns, such as signs of an ectopic pregnancy or lack of heartbeat, your healthcare provider will discuss the next steps with you, offering support and advice on how to proceed.

• Confirmation of Pregnancy and Heartbeat: One of the primary reasons for this scan is to confirm the pregnancy is developing inside the womb and to detect the baby’s heartbeat. This can provide immense reassurance to expectant parents.
• Determine the Number of Babies: Whether you’re carrying one baby, twins, or more can be identified during this scan.
• Assessing Pregnancy Viability: The scan assesses the health and viability of the pregnancy. It checks for any signs of an ectopic pregnancy (where the embryo implants outside the womb) and can help in identifying any early signs of potential complications.
• Estimating Gestational Age: The scan provides an estimation of how many weeks pregnant you are based on the size of the embryo. This helps in calculating a more accurate due date.

The most common Zodiac sign in the world is often considered to be Scorpio or Virgo, but this can vary depending on the birth rate in different months across different years. The birth rate can fluctuate significantly due to various factors, including cultural, social, and economic conditions that influence family planning decisions. Therefore, pinpointing the exact most common Zodiac sign globally with a specific number of people under that sign can be challenging without access to up-to-date and comprehensive birth data from all around the world.

However, it’s generally noted that September (Virgo and part of Libra) tends to have a higher number of births in many countries, largely due to the timing of conception around holidays in December. This observation suggests that Virgo might be among the most common Zodiac signs, given its period from August 23 to September 22.

If we assume a uniform distribution of births, which is admittedly a simplification, each Zodiac sign would have approximately 1/12th of the world’s population. With the world population exceeding 7.9 billion people as of 2024, each sign would theoretically encompass around 658 million people.

However, due to the aforementioned fluctuations in birth rates, the actual number for the most common sign could be slightly higher.

On the day of a day-5 blastocyst transfer you are considered 2 weeks and 5 days pregnant; after a day-3 transfer, 2 weeks and 3 days. This is because gestational age is counted from a notional last menstrual period two weeks before conception, plus the exact age of your embryo — one of the few advantages of IVF is that this number is known precisely, with no guesswork.

Most IVF pregnancies have a first viability scan at around 6 to 7 weeks — roughly 4 to 5 weeks after a day-5 transfer — when the heartbeat first becomes visible. Because the two-week wait and the weeks that follow are especially anxious after fertility treatment, our IVF pregnancy monitoring pathway offers repeated early scans rather than a single appointment.

Yes — but not every test is suitable, because some NIPT technologies rely on comparing the baby’s DNA with the birth mother’s. At the London Pregnancy Clinic, PrenatalSafe Complete Plus is validated for donor-egg and surrogate pregnancies, and our genetic counselling team will confirm the right option for your situation before you book.