I normally have a 27-28 days menstrual cycle. This march the ED was 11th but it came two days ahead on the 9th. I had unprotected sex with my boy friend on the 6th and 13th day. There might have had been some amount of accidental ejaculation. I started bleeding on the 16th day which continued for 4.5 days like a normal period, albeit a little light blood. i had stomach cramps on the 2nd day as is usually the case. Now am in a fix. Could you possibly tell me the reasons for this ?