Contraceptives that are injected or implanted, such as Depo-Provera, also may cause absence of menstruation or
amenorrhea. For some, it may take three to six months to resume regular ovulation and menstruation. This could
also be due to your hormonal imbalance or stress. At this point you could test for another pregnancy test
after a few days or if it persists, have this evaluated further by your gynecologist for proper management. A
complete physical and pelvic examination are important to determine the underlying cause.