I stopped bc in October and had a period every 31 days until January, I had no period in the month of January. Went to the doctor and she said it's normal to skip a month but sent me for a transnational ultrasound, everything came back normal. My period returned when it should have in February. I should have started my period on March 4th and it is still not here, I've had two negative pt. Looks like I skipped another month. Has anyone had this happen or know what may be causing me to skip a period and only have one every other month?