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Pregnancy Week by Week: One Week Pregnant. 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.
During the first trimester of pregnancy, many women experience the bouts of nausea and vomiting known as morning sickness. Despite its name, morning sickness can occur at any time, day or night. It usually begins around the 6th week of pregnancy, peaks around week 9, and disappears by weeks 16 to 18. Although unpleasant, morning sickness is considered a normal part of a healthy pregnancy.