Someone help!

So I suffer with pretty bad anxiety and I think this is just a product of that, but I wanted an outside opinion(s). I was 6 days late after lots of unprotected sex and then when I finally got my period it was super weird for me. Lasted only 3 days with only one of those having a substantial amount of bleeding, then just pink/dark brown spotting. I took a test after I stopped bleeding which was 10 days after my period would’ve started normally and it was negative. I took it late at night thinking at that point my hcg would be high enough not to need FMU if I was? But now I’m second guessing this since I’ve felt really off for the last couple weeks. I’ve been feeling super sick ever morning having to rush to the bathroom for lose stool. Then my stomach settles by mid morning but randomly will start up again during the day. I’ve had nausea randomly but not severe, but I’ve also been extremely tired through out the day needing to nap for a couple hours which isn’t like me. So what do you guys think, I’m just crazy right? I can’t stop stressing? 😅