I have been on birth control since the age of 18 from the pills, to the implanon in my arm for 3 years, to being on the shots for almost 2 years. My last birth control shot was in March and I didn't go back in June to get the next one. When I didn't go back my period came on immediately and from that point on from June July and August I have had 2 periods each month. My last period was August 28th-September 1st and today it's suppose to come on but haven't to make it the 2nd period of the month of September. I had unprotected sex on the 9th of this month could I be pregnant?