Medical Review Policy All What to Expect content that addresses health or safety is medically reviewed by a team of vetted health professionals. How to Calculate Your Due Date.
First day of last period Most pregnancies last around 40 weeks or 38 weeks from conception , so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period LMP. Conception date Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle.
IVF transfer date There are more than , assisted reproductive technology cycles performed each year in the United States, resulting in about 77, or more babies born a year, according to the Centers for Disease Control and Prevention CDC. The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, can also be a factor in pinpointing the EDD.
Can I plan my due date? Can my due date change? View Sources. Signs of Labor. Please whitelist our site to get all the best deals and offers from our partners. Your due date is calculated by adding days 40 weeks to the first day of your last menstrual period assuming a 28 day cycle. Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy.
If you deliver on your due date, your baby is actually only 38 weeks old, not Please remember that your due date is only an estimate. Every pregnancy is unique and your baby will come when it's ready.
Be sure to talk to your health care provider about your due date. Most are born within a week either side of the estimated due date. A normal pregnancy can last anywhere between 38 and 42 weeks. If you want to, you can view a sample due date report. Call us and speak to a Maternal Child Health Nurse for personal advice and guidance.
Need further advice or guidance from our maternal child health nurses? Support for this browser is being discontinued for this site Internet Explorer 11 and lower We currently support Microsoft Edge, Chrome, Firefox and Safari.
For more information, please visit the links below: Chrome by Google Firefox by Mozilla Microsoft Edge Safari by Apple You are welcome to continue browsing this site with this browser. If your menstrual cycle length is the average length day cycle , your menstrual cycle probably started about two weeks before you conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks.
This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts.
And women are more likely to know when their last period started than the day they ovulated. 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. Just choose that calculation method from the pulldown above and put in your date. Note: Again, you don't necessarily conceive on the day you have sex.
But for a fun read, see our stories from parents who know when and where they did the deed that resulted in their child. If you had a Day 5 embryo transfer, count days from your transfer date.
If you had a Day 3 embryo transfer, count days. 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. 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 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.
If you already know your due date, you can use this calculator to see your pregnancy calendar. It will tell you when you'll hit various milestones, like when your baby's heart starts beating, and when you may be due for prenatal tests and prenatal care.
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