i started my last period on october 13th and ended it on the 17-18th. i lost my virginity on the 18th and my boyfriend just put it in (unprotected) for about a minute, maybe two then stopped. today is the 27th and yesterday i had very light blood stuff on my underwear, which im pretty sure i had last month before my period. this morning i had some kinda dark brown stuff and some of it was dark red. please help, what does this mean? im supposed to start my period on november 10th. is this implantation? or an infection?