Very confused! Pre-cum

I am super confused on this whole pre-cum thing. I know you can get pregnant if it's inside, less likely but you can. 
But I've heard people say 'you can get pregnant if it's around your vagina' & I've heard that you can't. 
TMI < 
My boyfriend likes to rub his penis on my vagina, up & down (no clothes) he does it because we don't want to have sex yet, both virgins. 
 Let's say he has pre-cum, can I get pregnant?