Paranoid I might be pregnant

So I lost my virginity on April 11. I’m on the pill which I remember to take at the same time everyday and I made sure the guy used the condominium. I even made him check that it didn’t break. To be extra safe the next day I took plan b. 5 days later I got my period way earlier than expected. On Monday I took a pregnancy test which came out negative. I took 3 more and they were all negative. I’m still really stressed about that I could be pregnant since I read that not all negative tests are accurate. What should I do?