I lost my period on may 30th and it was the most painful and bloody period I've had. I had sex the next day. 2 days after I had sex I started getting headaches then a day or two later I felt sick, nauseated and felt cramps almost like period cramps but I felt really gassy. I haven't thrown up, I am breaking out, I'm bloating a little bit, I'm not sensitive to smells but I have felt a little more tired then usual. Could I be pregnant? It wasn't even a week after I had sex only a few days and I got all these symptoms.

Much too soon to experience any symptoms or even test.
You need to wait for your next cycle.