Freaking out. 18. Help.

Me and my boyfriend have been together a while but have only been having sex for 3 months or so. When he took
​My virginity, my period came 10 days late. Last month I started on time and this month I'm supposed to start today but haven't yet. I panic every month because getting pregnant could be dangerous for me. So
​My question is... 
​We have sex with a condom and he pulls out before he finishes. The condom has spermicide and has never torn, ripped or broke. What's the likelihood I'm pregnant?