any way to calm myself?

I used to have unprotected sex just the "pull out method" for 5 years until i got pregnant, long story short i was forced into an abortion now when i have sex i get so paranoid about getting pregnant again. I now do use condoms & try to be so careful. I use them from start to finish & after i check them for breakage by filling them up with water. They haven't broke or slipped. I can't be on birth control so condoms my only safety. We don't even foreplay so can precum can get near me. Am i just overreacting to all this? I had sex last sunday & today i feel like im gonna start my period but I don't start until next week & im over analyzing that it can be implantation or idk 😞