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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.
Third prenatal appointment: Occurs between the 14th and 16th week of pregnancy. The second trimester begins at week 14 of your pregnancy. Around now you will hopefully begin to have more energy and less morning sickness. You may also start to appear pregnant.