lost verginity..unconsiously-i dont remember how

hi, i lost my verginity 2 weeks ago but i dont remember how;cos i was unconsious ,my boy friend put something on my drink..he admit it later that he had sex with me...but i cant remember anything...can i get pregnant after losing my verginity and i was almost you can say rapped while im unconsious? he claim that i was almost like a sleeping doll when he did it.. the only thing i had is dark brown discharge...the next morning and a period pain..i thought i had my period but then it stopped..
please help im so scared!!can i get PREGNANT??