Bf problems

Deissy
So I moved in with my boyfriend 4 months ago and everything was good at first then I started seeing my mom and things turned around now all the sudden he's always stuck in his moms room and I'm in our room and I feel dumb because he should be spending time with me not his mom, then now all the sudden he wants to start talking to girls because he needs girl friends and I don't like that and he doesn't understand now I feel like "oh he finally got what he wanted now he wants to talk to girls" and his mom says its okay that I shouldn't worry because I have him, then the bad part is that I might be pregnant and I don't want to be stressed out... Can y'all please give me advice..