Late period,virgin,but panicing

Hey girlss!Soo i have a bf but we are both virgins and he hasn’t even fingered me.He is only rubbing my clit but OVER MY PANTS.He has never touched my pussy😂And i have touched his penis again over his pants.But my period is late now and i always thing ,,what if i am pregnant now”.I know that i can’t get pregnant without having sex but i always thing like that.I imagine how the sperm goes through my pants,then my underwear and then in me.Help me how can i get through this and how to stop thinking that i am pregnant without even having sex.