First solar day of final period

Most pregnancies terminal around forty weeks (or 38 weeks from conception), and so typically the all-time way to estimate your due date is to count twoscore weeks, or 280 days, from the first twenty-four hour period of your final menstrual period (LMP). Y'all could likewise subtract 3 months from the first day of your terminal period and add seven days.

The kickoff 24-hour interval of your LMP is how nigh health care providers estimate a baby's due date. Just retrieve, it's only an estimated due date, not a deadline for your infant to go far. Merely 4 per centum of babies are born on their estimated due engagement.

Formulation engagement

If you've been tracking ovulation symptoms or have been using ovulation test strips, then you may exist able to use your conception date to calculate your pregnancy due date. Just add 266 days to go your estimated due date (or select "Conception Date" from the menu above, and let our Due Date Reckoner do the math for you).

IVF transfer appointment

If you conceived through in vitro fertilization (IVF), you can calculate your due appointment using your IVF transfer engagement. About embryo transfers occur either three days or five days after egg retrieval and fertilization. If you lot had a day-three transfer, count 263 days from the transfer date to calculate your due date, and if you had a mean solar day-five transfer, count 261 days. (Or select "IVF" from the menu above.)

Ultrasound scan

Fifty-fifty if you can't pinpoint when y'all conceived, forget the day of your final menstrual menses or aren't sure when ovulation occurred, other clues tin help you lot and your practitioner make up one's mind your due date at your first prenatal appointment, including:

  • An early ultrasound, which tin more accurately date the pregnancy. Only exist aware, however, that not all women get an early ultrasound. Some practitioners perform them routinely, merely others only recommend 1 if your periods are irregular, y'all're 35 or older, you take a history of miscarriages or pregnancy complications, or the due appointment can't be determined based on your concrete examination and LMP.

  • Pregnancy milestones such as the kickoff time the baby's heartbeat is heard (effectually week ix or 10, though it can vary) and when you first feel fetal movement (on average betwixt 18 and 22 weeks, merely it can exist earlier or after), can requite 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 engagement.

  • The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, tin likewise exist a cistron in pinpointing the EDD.

Tin I plan my due date?

Whether you lot're trying to avert being very significant in the centre of summer or are a teacher who wants to maximize time off with your niggling i, you tin try to fourth dimension when you lot conceive in club to "plan" your due date. Merely fifty-fifty if you're one of the lucky ones who'southward able to get significant when she actually wants to, but recollect that you probably won't be able to map out exactly when you lot'll requite birth to the day (or even the week or calendar month!).

Yet, you can try our Ovulation Calculator, which uses the date of your last menstrual menstruation and your typical bike length to notice the days you're most probable to exist fertile and increase your chances of conceiving.

Can my due date change?

Yeah, your due date tin can change. While it's definitely not a reason to worry, your medico may modify your due date for a number of reasons as your pregnancy progresses.

Information technology may be that you accept irregular periods and your early on ultrasound dating was off, or that your starting time ultrasound was in the second trimester.

It could as well be because your fundal peak is abnormal, or your levels of blastoff-fetoprotein (AFP), a protein made by the baby, are outside the usual range. Talk to your practitioner if you have whatever questions or concerns.