okay so i had my child at 15....ever since then i probably got my period like 4 times through out 2 1/2 years.....i didnt know if that was good or bad....anyways after that time passed i didnt get my period at all during 1  year....no periods and i was not pregnant becasue i was not dating or being intimate with anyone. then i meet my boyfriend at age 18....so after 5 months of dating we had sex obiously with a condom, then i got my period 2 weeks later and since then i ve had my period every 3 months i dont know why... any suggestions? any way me and my boyfriend have been together almost 3 years now and just recently in august 2012 i had my period .....i think it was beacuse i had gone to the bathroom and started to bleed but when i finished all the bleeding had stopped..since then until now i have not had my period.. does anyone know why this is or if its normal......???