3 negative tests

It’s been almost four weeks since I’ve had sex and it was protected but I already have irregular bleeding so I’m just a little paranoid. I think I had a real period and not just early pregnancy bleeding two weeks early and a week after I had sex. It lasted for about five days and got as heavy as my periods usually do, blood clots and all. All tests have come back negative that I’ve taken this week. I only was worried because I had brown spotting but I used to get brown spotting during ovulation before I started the pill so maybe it’s just that? My cycle is all over the place so I never know. But three negative tests, even one early this morning. I guess I just need some reassurance lol