Pregnancy Home > One Week Pregnant

At one week pregnant, you're not actually pregnant. Week one of your pregnancy begins on the first day of your period; conception usually occurs about two weeks after that. There are two primary ways to calculate your due date; adding nine months and one week to the first day of the last menstrual period is the most common method.

One Week Pregnant: An Overview

During the first week of your pregnancy, you are not actually pregnant. Conception usually occurs about two weeks after your period begins, which means that your period is counted as the first part of your pregnancy, even though you were not pregnant at the time. In other words, week one of your pregnancy begins on the first day of your period.
 
(Click 3 Weeks Pregnant to learn about the first week of your baby's development.)
 
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Last reviewed by: Arthur Schoenstadt, MD
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