First time having sex and stressing out about birth control!!!

Okay so my boyfriend and I have had sex three times so far. The first time he didn’t come inside but then the second time he did, but we were using a condom. Still condoms are not always 100%. We checked after to see if it broke or anything was leaking out but nothing seemed to be. I guess I’m just freaking out a little but it’s scary cuz it’s my first time dealing with this stuff and lord knows I cannot tell my mom lol I’d be dead. I’m getting on the pill pretty soon, even though I might not be pregnant, if I was would the birth control kill off the fetus? (Sorry if that offends anyone) So basically I new to this and I need some guidance, what do u guys think lol. 💕🤷🏻‍♀️