!!!!!!HELP!!!!!!

My boyfriend and I had sex Friday night (4/20/18) it was my first time, but we didn’t use protection because I’m allergic to latex. He said he didn’t come inside of me. We had sex the next morning and he came but not in me. What should I do to make damn sure I don’t wind up 16 and pregnant?! Also I’ve not told my mom because she will not look at me or my boyfriend (who she really likes) the same way, and I don’t want to hear the whole “tooooo youuuung” thing, and she doesn’t want me to go to the GYN until I am ready to have sex. PLEASE HELP. ANY ADVICE IS GOOD.