I have severe anxiety and hypochondria, after unprotected intercourse, I am feeling bloated

Hi guys , I'm 17 and I have severe anxiety and hypochondria. I recently had protected sex on the 9 of March and then had a short 3 days period. He didn't finish inside of me so I don't think there's any way I could be pregnant. But since the short period I started bloating every day and having to pee all the time. I went to the dr almost three weeks later and had blood work done and that came out negative. So did all 6 of my at home test. It's now the 4th of April and I'm having some time of dark heavy period with heavy cramps when I usually have my period on the 16th. I did just come off of birth control 2 days ago after being on it for only 9 days with terribly side effects. Is this all normal? Am I over thinking things? Am I pregnant?