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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.
6 weeks pregnant - this is the second month or first trimester. On the 6th week of pregnancy the nervous system of the fetus fortifies. On the end of the nerve tube the brain forms. The fetal placenta becomes more solid. The arms, hands, legs and head form as well. The space occupied by the amniotic fluid rises to 3 ml.