Pregnancy birth date estimator

Once you find out you're pregnant, one of the first questions you may ask is when is your due date. Determine the date of your last menstrual period (LMP) before you found out you were pregnant.
Choose other methods to calculate your due date if you cannot remember the date of your LMP or have irregular periods.
We generally consider the normal time frame to be two weeks before your due date, until two weeks after your due date. Since the date of conception is rarely known, learning how to calculate your due date is based on if you can remember the date of your last menstrual period (LMP) before the pregnancy test read positive. An easier way in figuring out due dates is to take the first day of your last period, count backward 3 months, add 7 days, and add an entire year.

Search in the term "free due date calculator" online and click on a reputable looking source. Since proving the date of conception is notoriously finicky, many online calculators suggest you stick with your LMP, which it then uses to calculate your due date.
Estimating your due date on your own or using a website can give you a rough idea as to when you might deliver, but a doctor can confirm how far along you are. A due date is not set in stone, nor should it be: your baby will pop out whenever she is ready to, and hopefully not a day sooner or later. Most multiple pregnancies do not make it to 40 weeks, and some doctors may want to induce you based upon the progress made by the fetuses. To get a more accurate measure, you may want to wait until you see the doctor and have an ultrasound to determine the baby's gestational age and your due date.

At your first prenatal appointment, your doctor may order a vaginal ultrasound to more accurately determine your due date. Only about 5% of babies are actually born on their due date, but you need to have a general idea of when your baby should arrive to monitor its progress and development. If you know the day(s) of ovulation, just add 266 days to that date to determine a very rough estimate.

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