29F, only use condoms, and I’m terrified I could be pregnant without knowing. Talk me down?

I only started being sexually active a few months ago. Condoms are my only birth control. I don’t want to go on the pill or get an IUD, so this is what I’m sticking with, and I’m careful about it.
Here’s the thing that’s eating me alive. I keep seeing videos and posts here on reddit or Tik Tok where people say they got their period regularly while pregnant and didn’t find out for months. It seems almost common online and now I can’t stop thinking about it. I’ve always gotten my period on time, every month, so logically I feel like I’m fine. But I’ve never taken a pregnancy test in my life, and that gap between “my period is normal” and “but what if I’m the exception” is making me spiral. I have such bad anxiety over this that sometimes i convince myself i am. Even after sex, I do the water test to make sure there are no holes and nothing is leaking. But I’m still so scared that I need maybe another form of contraception? Like is only using condoms okay? Should I take a pregnancy test even if I have gotten my period? Sorry if I sound crazy, I’m so new to this still