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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.
The first trimester of pregnancy is often considered the second most exciting time during pregnancy. Birth is, of course, the most exciting time. During the first trimester of pregnancy, women find out they are pregnant, attend the first prenatal appointment and notice a long list of changes in their body.ven before the pregnancy test reads positive, there are changes happening during the first trimester of pregnancy. During ovulation the egg is released and the corpus luteum signals the release of progesterone.