Why do I worry so much

I need some serious help. I’ve been talking to a counselor and it helps sometimes but others I just can’t get over it. I’m super paranoid about getting pregnant, mostly becuase I don’t want to get pregnant before I’m married as my family would be really disappointed and my career would have to take a step back. I’m on the pill and take it perfectly. I’m in a long term relationship with my boyfriend and he wears condoms and pulls out before finishing. I always check the condom once we are done and so far none of them have leaked out, but it never fails, a week before my period is supposed to start, I get super worried that I’m pregnant. I just don’t know what to do anymore. I’ve been dating my boyfriend for over a year and we started having sex about 6 months ago. I need some advice that’s not mean please.