Halfway point! Baby can swallow and may suck its thumb.
Key Pregnancy Milestones & Appointments
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Week 4: Implantation & Positive Test
May 8, 2026
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Week 6: Heartbeat Detectable
May 22, 2026
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Week 10: First Prenatal Visit
Jun 19, 2026
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Week 12: End of 1st Trimester
Jul 3, 2026
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Week 16: Prenatal Screening (Quad Test)
Jul 31, 2026
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Week 18: Anatomy Scan & First Kicks
Aug 14, 2026
24
Week 24: Age of ViabilityNEXT
Sep 25, 2026
27
Week 27: End of 2nd Trimester
Oct 16, 2026
28
Week 28: Glucose Tolerance Test
Oct 23, 2026
32
Week 32: Growth Ultrasound
Nov 20, 2026
36
Week 36: Group B Strep Test
Dec 18, 2026
37
Week 37: Early Full Term
Dec 25, 2026
40
Week 40: Estimated Due Date
Jan 15, 2027
Recommended Pregnancy Weight Gain
Based on IOM (Institute of Medicine) guidelines. Enter your pre-pregnancy measurements.
Medical Disclaimer: Estimates are calculated using standard clinical formulas (Naegele's rule for LMP, 266 days post-conception, IVF transfer offsets). Always confirm due date with your OB/GYN or midwife.
Affiliate disclosure: links above may earn us a commission — this never affects the calculation results above.
⚕️MEDICAL & YMYL DISCLAIMERReviewed August 2026
Educational Purpose Only: The calculations, formulas, and estimates provided by this pregnancy & obstetrics calculator are intended solely for educational, research, and informational purposes. They do not constitute medical advice, diagnosis, or personalized treatment plans.
Always consult a qualified healthcare professional, physician, or registered dietitian before making changes to your diet, exercise regimen, calorie intake, or pregnancy care plan. Never disregard or delay professional medical advice because of something you read on this website.
SCIENTIFIC FORMULA & METHODOLOGY
SART Clinical IVF Dating Protocol
• 5-Day Transfer (FET): Due Date = Transfer Date + 266 Days - 5 Days
• 3-Day Transfer: Due Date = Transfer Date + 266 Days - 3 Days
• Egg Retrieval: Due Date = Retrieval Date + 266 Days
Because the exact fertilization and embryo transfer dates are precisely known in IVF, gestational dating is more accurate than natural LMP methods.
Clinical Limitations & Considerations
Full-term singletons and twin IVF pregnancies may deliver before 40 weeks as advised by your reproductive endocrinologist.
Scientific References & Literature
Society for Assisted Reproductive Technology (SART) (2020). "Clinical Guidelines for Assisted Reproductive Technologies."
Frequently Asked Questions
How is an IVF due date calculated for a 5-day transfer?
Add 261 days (266 days minus 5 days of embryo development) to the exact date of your 5-day embryo transfer.