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. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date. Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife.
Only 1 in 20 women delivers on her due date. You're just as likely to go into labor any day during the two weeks before or after. Want more information about how the weeks, months, and trimesters of pregnancy are counted?
See our pregnancy timing chart. BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals.
We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies. Join now to personalize. Choose a calculation method Last period Conception date I know my due date. First day of my last period. If you are part of the growing tribe of in vitro fertilization IVF moms, you can calculate your due date more precisely using your IVF transfer date. An early ultrasound, which can more accurately date the pregnancy.
Just be aware, however, that not all women get an early ultrasound. Pregnancy milestones such as the first time the baby's heartbeat is heard around week 9 or 10, though it can vary and when you first feel fetal movement on average between 18 and 22 weeks, but it can be earlier or later , can give clues as to whether your due date is accurate. Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date.
Whether you're trying to avoid being very pregnant in the middle of summer or are a teacher who wants to maximize time off with your little one, you can try to time when you conceive in order to "plan" your due date.
But even if you're one of the lucky ones who's able to get pregnant when she really wants to, just remember that you probably won't be able to map out exactly when you'll give birth to the day or even the week or month! Still, you can try our Ovulation Calculator , which uses the date of your last menstrual period and your typical cycle length to discover the days you're most likely to be fertile and increase your chances of conceiving.
Yes, your due date can change. It may be that you have irregular periods and your early ultrasound dating was off, or that your first ultrasound was in the second trimester. It could also be because your fundal height is abnormal, or your levels of alpha-fetoprotein AFP , a protein made by the baby, are outside the usual range.
Talk to your practitioner if you have any questions or concerns. The educational health content on What To Expect is reviewed by our medical review board and team of experts to be up-to-date and in line with the latest evidence-based medical information and accepted health guidelines, including the medically reviewed What to Expect books by Heidi Murkoff. This educational content is not medical or diagnostic advice.
Use of this site is subject to our terms of use and privacy policy. This pregnancy due date calculator will give you a rough idea of when your baby should be born. If you know the date of the first day of your last menstrual period LMP , or have already had your first ultrasound scan, you can use this tool.
Please remember that the result will not necessarily be the day that your baby arrives. The actual date may be any time from 38 to 42 weeks in most pregnancies. If problems occur you may be advised that delivering your baby earlier is the safest option. For advice on recognising signs that you are going into labour , or for information on some types of pain relief in labour, follow the links.
We also have information on how your baby is monitored in labour.
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