Tell me I'm paranoid

So I have a pretty active sex life. No shaming please, but I'm 17. I have had sex with my boyfriend 2 to 3 times in the last month or so. I'm on birth control, and he pulls out. We usually use condoms but the last two times it was the heat of the moment and none were on hand. He didn't come in me (he says) but I'm two days into the last week of my pills when I'm supposed to get my period. Glow says I should start in two days but I'm getting a little nervous. I know that it's always a possibility to be pregnant when you're sexually active, but am I just prematurely worried?