little advice would help please

I had sex for the first time ever last weekend. I’m terrified of getting pregnant, so I took several precautions. My boyfriend and I used a condom for most of the time, and he pulled out, AND I’m on birth control. The problem is that i’m not very good at remembering to take my pills and end up doubling up a lot or having to skip packs all together (and like i said we used condoms most of the time but there were a few moments where we didn’t). I’ve been having my typical pms symptoms, but they are also typically early pregnancy symptoms. Tender and swollen breasts, slight stomach muscle spasms, mood swings, nausea, ect. Maybe I’m just paranoid, but I can’t afford to not be extremely careful. Also, I don’t know if it was during my fertile window because I just now re-download the app and had to get a new account.

I just need some insight or thoughts on my situation please