Period Late Negative Test?

Dylan

So I'm 20 years old and have had some really bad bloating and cramping these last two weeks. I stopped my birth control pill last month after being on it for 4 years and my SO and I had sex without protection a few times (dumb I know! We didn't know precum had sperm in it! Only used withdrawal method). My period is a couple days late now and still no sign but bad cramping. I've taken two tests and they were both negative (including one at the doctors office that was 100% neg) any ideas what's going on?? Can coming off the pill make me late? Also why am I SO crampy and bloated?? -- feeling 😩