Hippocrates was the first to estimate that pregnancy lasts 280 days, 40 weeks, or 10 lunar months. This was later confirmed in 1978 by Carus and Naegele. While the duration of pregnancy can vary depending on individual factors, it’s common for birth to occur anytime between week 38 and week 42. In natural conception, the estimated due date is calculated based on the first day of the last period. However, if you're wondering how to calculate the delivery date after an IVF procedure, this post will guide you through the process.
How to Calculate the Delivery Date After IVF
For women who conceive through IVF (in vitro fertilization), the calculation of both the pregnancy weeks and the estimated due date is different from natural conception. In IVF, the focus is on the day of embryo implantation, as fertilization took place in the laboratory about 48 hours earlier. This is different from natural conception, where the fertilized egg takes about 7 days to implant in the uterus.
To calculate the probable delivery date in IVF, you add 270 days (instead of the typical 280 days for natural conception) to the date of embryo implantation. It’s important to remember that the due date is just an estimate, and only a small percentage of women actually give birth on the exact day predicted by the doctor.
Trimesters of Pregnancy
Another term you’ll often hear during pregnancy is trimester, which divides pregnancy into three stages. Below is a breakdown of each trimester and what to expect.
First Trimester: Week 1 to Week 12
During this phase, you'll have a medical exam to confirm the pregnancy, and the first ultrasound will be done to verify that the fetus is inside the uterus and developing correctly. You’ll also have tests to determine your blood group, check for anemia, and assess your immunity to certain infections. Common symptoms in this stage include nausea and vomiting.
Second Trimester: Week 13 to Week 26
In the second trimester, tests are performed to ensure the baby is developing well. Most women report this as the most comfortable period of pregnancy because nausea often subsides, and the fetus isn’t yet large enough to cause significant discomfort. During this time, you can also find out the sex of your baby if you choose to.
Third Trimester: Week 27 to Delivery
This final stage can be more physically demanding as the baby grows larger, which may lead to fatigue, back pain, and swollen feet. It's important to get rest and do light exercises to manage weight. During this trimester, you'll likely attend a childbirth preparation course, which can be helpful for learning to recognize the signs of labor.
Visits to your gynecologist will increase during this trimester:
Every 4 weeks until week 36.
Every 2 weeks until week 38.
Weekly after week 38.
These visits help monitor the condition of the placenta and the amniotic fluid. Around week 40, your doctor may begin fetal monitoring to check the baby’s heart response to uterine contractions. A vaginal culture will also be taken to detect any streptococcus infections, which could be passed to the baby during childbirth.
Conclusion
The 9 months of pregnancy bring a range of emotions, physical changes, and new experiences. Don’t hesitate to consult your specialist about any doubts or concerns you may have along the way, and always follow their advice.
At Nicosia Fertility, we are here to guide and support you throughout your pregnancy journey, especially after IVF treatment. Contact us if you need more information or assistance!
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