IVF Pregnancy Calculator (Week by Week)
Enter your embryo transfer details to estimate gestational age, due date, and your personalized week-by-week timeline.
Educational tool only. Always follow your fertility clinic or OB provider for medical decisions.
How this IVF pregnancy calculator works
IVF dating is different from a spontaneous pregnancy because your fertilization and transfer dates are known. In natural conception, pregnancy is usually dated from the last menstrual period (LMP). In IVF, we can estimate an IVF-adjusted LMP by counting backward from transfer.
- IVF-adjusted LMP = transfer date minus (14 + embryo age in days)
- Estimated due date (EDD) = IVF-adjusted LMP + 280 days
- Current gestational age = today minus IVF-adjusted LMP
Why embryo age matters
If you transferred a day-5 embryo, that embryo had already developed for five days before transfer. That means your pregnancy is considered a little further along on transfer day compared with a day-3 transfer.
At transfer, gestational age is approximately:
- Day-3 transfer: 2 weeks + 3 days
- Day-5 transfer: 2 weeks + 5 days
- Day-6 transfer: 2 weeks + 6 days
IVF week-by-week milestones (general guide)
Every pregnancy is unique, but these are commonly discussed milestones. Your clinic protocol may differ slightly based on your history.
Weeks 4 to 6
- Beta hCG blood testing often occurs about 9 to 14 days after transfer.
- Rising hCG levels are checked to confirm early progression.
- Early ultrasound may begin around 6 to 7 weeks gestation.
Weeks 7 to 12
- Heartbeat confirmation is commonly seen by this period.
- Many patients transition from fertility clinic care to OB care around 8 to 10 weeks.
- First-trimester screening and NIPT are often discussed around week 10 onward.
Weeks 13 to 27
- Second trimester usually begins at week 14.
- Anatomy scan is typically done near week 20.
- Monitoring plan may vary depending on maternal age, prior history, or multiple gestation.
Weeks 28 to 40
- Third trimester begins at week 28.
- Growth scans and visit frequency often increase later in pregnancy.
- Week 39 is considered full term, with delivery planning individualized by your care team.
Frequently asked questions
Does this work for frozen embryo transfer (FET)?
Yes. The dating method is based on transfer date and embryo age, so it works for fresh or frozen transfers.
Is IVF due date calculation more accurate?
IVF dating is generally very precise because timing is known. Ultrasound remains important for confirming development and guiding care.
Can this replace medical advice?
No. This tool is for planning and education only. Contact your fertility specialist or obstetric provider for personalized guidance.
Final note
A pregnancy calculator for IVF week by week can make your timeline easier to understand, especially between appointments. Use it to stay organized, prepare questions, and follow your progress with confidence.