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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.
Headaches are one of the most common discomforts experienced during pregnancy. Headaches may occur at any time during your pregnancy, but they tend to be most common during the first and third trimesters. During the first trimester, your body experiences a surge of hormones and an increase in blood volume.