Am I pregnant?

I had unprotected sex on 6/28 on one of my most fertile days. Ever since I’ve been worried. About a week after I started getting sore breasts. My period was supposed to start yesterday but about 5 days ago I started getting really nauseous and throwing up. Then I started bleeding 3 days ago. Not a lot and definitely not anywhere near what my normal period is like. The cramps weren’t as bad and I didn’t bleed as much as normal. It stopped yesterday after only spotting that morning. I took a test this morning but it was negative. Should I take another test in a couple days or just stop worrying?