Pregnancy Basics

If you’re facing an unplanned pregnancy, you might not know what to expect in the coming months.

Your Due Date

As a first step, you’ll want to figure out your baby’s due date. This is the date that your baby is most likely to be born. To calculate your baby’s due date, enter your information into our pregnancy due date calculator below. The calculator also estimates the date you conceived and how far along you are in your pregnancy.

Your due date is calculated by adding 40 weeks — the length of an average pregnancy — to the first day of your last period.

Only five percent of babies are born on their due date, so this estimated due date should only be used as a guide. Most babies are born in the two weeks before or after their estimated due date.

Pregnancy Timeline

A typical pregnancy is divided into three parts called trimesters. Each trimester lasts about three months and an average pregnancy lasts nine months, or 40 weeks. When referring how far along you are in your pregnancy, you’ll usually use the number of weeks.