HELPPPPPPPPPPPPP !

Shatari
I got my period December 10 i was on for 7 days and i got off onna 17th but i had sex way in the beginning of the month but it wasnt no semon or none of that ....... I had sex after i got off my period with my boyfriend and i felt semon go in and this was December 23rd and the very next day i ovulated and conceived onna 24 so would i be 3 months ( 12 weeks )? So when did i get pregnant by the boy at the end or the beginning?