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. They might also do early ultrasounds if you have risk factors including previous pregnancy complications, a history of miscarriages or other pregnancy losses, irregular periods or trouble conceiving, various chronic health conditions, or are 35 or older. Some practitioners perform them for all expectant patients, while others only do them if your due date can’t be calculated by the usual methods or determined via a physical exam. Remember, however, that not all pregnant women will have an ultrasound at their first prenatal appointment or another early check-up. Just choose 'ultrasound' from our Due Date Calculator dropdown menu. The timing of an early ultrasound can sometimes more accurately date the pregnancy than your last menstrual period, conception date, and other methods. If you want to try a different method for calculating your due date and are among those who have at least one early, first trimester ultrasound, that scan in your doctor’s or midwife’s office can help you and your practitioner pinpoint when your baby is expected to arrive. Or select 'IVF' from our Due Date Calculator method choices. 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. Remember, 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 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 period 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) (or choosing that option from our tool’s menu above). So without knowing the day of conception, how does anyone determine a due date? First day of your last period Meaning 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. The tool will do the rest! How is my due date calculated? Use our pregnancy due date calculator by plugging in the date of your last period, the date you conceived if you know it, the timing of your IVF transfer, or your first ultrasound date.

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