To arrive at your baby due date, count forward 40 weeks (that’s the 38-week gestation plus two weeks) from the first day of your last period and mark a big X on your calendar for Baby Day! Or, if you’d rather not rely on your math right now (the pregnancy brain struggle is real), simply plug the date of your last menstrual cycle into The Bump pregnancy due date calculator above and get instant results. If you have an average-length cycle (about 28 days), your period came about two weeks before you ovulated and conceived. ![]() The most common way of determining when baby will be born is to calculate your due date based on your last menstrual period (LMP), which is how a pregnancy calculator works. How to Calculate Due Date Based on Last Period That’s where a due date calculator, also known as a pregnancy calculator, helps. It’s enough to make a mom-to-be’s head spin. Conception happens when your egg is fertilized, but since sperm can live inside your fallopian tubes for up to five days waiting for an egg to be released, you could conceive up to five days after having sex. ![]() Even if you had sex only once during your six-day fertile period, you may not have actually conceived that day unless you happened to be ovulating. But figuring out an accurate due date based on conception date is easier said than done: Unless you were really deliberate about tracking your ovulation or were able to make a baby in one shot (and had no extracurricular fun with your man otherwise), knowing which day was the big one isn’t clear cut. It’s just a way to provide a window of time in which you are likely to go into labor.If you happen to know the exact day you conceived, you could calculate your baby due date by counting 38 weeks from the date of conception (38 weeks is said to be the length of human gestation). Even with IVF and ultrasound measurements, no due date is a guarantee. How accurate are IVF due dates?ĭue date calculations may vary regardless of whether you conceived naturally or via IVF. *If the blastocysts’ age is more than 5 days, you need to subtract their exact age. 5 day FET - Transfer date + 266 days (or 38 weeks) – 5 days (for blastocysts)*.*Sometimes your embryos’ age is more than 3 days, so it’s important to subtract the exact age of the embryos. 3 day FET - Transfer date + 266 days (or 38 weeks) – 3 days (for embryos)*.Fresh donor embryo cycle - Egg retrieval date + 266 days (or 38 weeks).IVF with fresh donor egg cycle (with or without ICSI) - Egg retrieval date + 266 days (or 38 weeks).IVF with own eggs (with or without ICSI) - Egg retrieval date + 266 days (or 38 weeks).This is how Flo’s calculator formulas work based on your IVF type (these formulas are set automatically in the calculator for each option you choose): Choose your IVF type in the “Type of transfer” field of the calculator. You can calculate your due date by using different formulas depending on the type of IVF you had. Enter this date in the “Date of transfer” field of the calculator. In-vitro fertilization (IVF) is the only case in which your health care provider will know exactly when you conceived. ![]() This is why a due date is just a rough estimate of the day the baby is likely to arrive. However, this date isn’t 100-percent accurate, as ovulation can occur earlier or later. Someone with a regular 28-day menstrual cycle usually ovulates around day 14. The reason is that most people don’t know exactly when they ovulated or conceived. If you conceive naturally, the estimated due date is usually determined based on the first day of your last period, not from the date of conception. Typically, pregnancy lasts for about 40 weeks, or 280 days.
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