Okay, so i am 15 had periods since the age of 12 .. My boyfriend and I had protected sex (condom) three times in a week or so.. the first two times he didn't ejaculate inside me but the last one he did... The last time we had sex it was 2 days before my period.. Now , two days after i got my period with cramps normal flow and everything.. and my period always lasts 8 days but now i had normal to heavy flow for about 3 days and then suddently on the 4th day it started to become more and more light with brown blood.. today im on the 7th day of period and have light brown flow... Is it possible for my body to dont know i was pregnant before implantation and started my period normally but then when "implantation" happened just slowed down my period? Or am I too worried and not pregnant? please help me !!