Unprotected sex

So me & my boyfriend had sex for the third time . i rode him this time & it felt really good . the last times we had sex he could never go deep bc it hurt me so much but this time he went all the way in ! There was some pain , not too severe . When he went to go orgasm he pulled out & nutted on my butt .. Is there any way his semen could have slipped inside me through the back ? Im curious bc when i touched myself it was white , then it went clear. Im in alot of pain too in my vagina now . feels like its gonna fall off !