As a result, IVF due date calculation can be pretty precise. If you conceived via in vitro fertilization, you’ll know exactly when the egg was fertilized. (Technology needed) No simple formula here! Due date is based on the first day of your last menstrual period as well as baby’s size and growth rate during the first trimester. Your doctor will monitor baby’s growth during the first trimester based on the expected gestational age from your last menstrual period. Babies tend to grow at various rates, so some may arrive 2 to 3 weeks before or after the predicted due date. After your first prenatal visit, your healthcare provider will schedule an ultrasound to confirm the pregnancy.ĭuring an ultrasound, your doctor will measure baby’s length–from crown to rump–to determine how many weeks along in your pregnancy you are and calculate your due date. + 38 to 40 weeks = Due Date Based on Conception Dateįor example, if you conceived on October 15, your due date would be around July 8 to July 22.Īh yes, modern technology: the ultrasound, we love you. Your doctor can help calculate your pregnancy due date via ultrasound, which is especially helpful if you have irregular periods. So unless you’d been using an ovulation tracker or were able to make a baby in the first go, knowing the date of conception isn’t that clear cut.Īny who, we’ll still give you the formula just in case you do actually know when you conceived. During your six days of fertility, you may not have conceived unless you were ovulating. Sperm can live up to five days in the fallopian tubes before fertilization. But here’s the big mystery: when exactly did fertilization occur? You may know the date of intercourse, but that’s not necessarily the date of conception. If you know your date of conception (aka when the sperm met the egg), you can count 38 to 40 weeks out to calculate baby’s due date. Earlier ovulation means you’ll give birth earlier later ovulation means you’ll give birth later than your expected due date. But many women have longer or shorter cycles and ovulation tends to occur later rather than earlier. Pregnancy calculators are typically based on a 28-day cycle and assume that ovulation occurred on day 14. The problem with calculating your pregnancy due date based on your last period is that both the human gestation formula and Naegele’s rule are based on a variety of averages. 3 months) + 7 days = Due Date Based on Last Periodįor example, if your last menstrual period began on June 6, your estimated due date would be March 13. It’s simple: count back three months from the first day of your last period and add 7 days. Most pregnancy calculators found online are based on this rule. + 280 days = Due Date Based on Last Periodįor example, if your last menstrual period began on May 20, your estimated pregnancy due date would be February 24, 280 days later.Īnother way to calculate the delivery date is a formula called Naegele’s rule.
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