Want more information about how the weeks, months, and trimesters of pregnancy are counted? See our pregnancy timing chart. You're just as likely to go into labor any day during the two weeks before or after. Only 1 in 20 women delivers on their due date. Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife. How likely am I to give birth on my due date? You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date. It will tell you when you'll hit various milestones, and when you may be due for prenatal tests and prenatal visits. If you already know your due date, you can use this calculator to see your pregnancy timeline. Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date. This is more likely to happen if you have an irregular menstrual cycle length that makes it hard to pinpoint the date of conception. Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound scan and found to be much bigger or smaller than expected for gestational age. If you had a Day 3 embryo transfer, count 263 days. If you had a Day 5 embryo transfer, count 261 days from your transfer date. If you conceived through IVF, you can calculate your due date using your IVF transfer date. Note: Again, you don't necessarily conceive on the day you have sex. Just choose that calculation method from the pulldown above and put in your date. If you do happen to know precisely when you conceived – say, if you were using an ovulation predictor kit or tracking your ovulation symptoms – you can calculate your pregnancy due date based on your conception date. And women are more likely to know when their last period started than the day they ovulated. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts.
This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks. If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. And that's how most healthcare providers do it. The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). So, without knowing the day of conception, how does anyone determine a due date? First day of your last period So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. Sperm can live for up to five days inside your fallopian tubes. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. (Human gestation takes about 38 weeks.)īut very few expectant moms know exactly when they conceived. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. There are several ways your due date is determined. Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived.
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