Weird..

So I had my period 10/5 though 10/7. Typical period, a bit lighter than usual, with more of a mucus consistency. But a period all the same. It ended, than a couple days later I had brown spotting. Not abnormal for me. Old blood and such. Well I'm on my fertile week, and I've been nauseous the whole time. Yesterday and the day before I had cramps and bloating. I've extremely nauseous right now. No fever, no reason that I could think of that would make me sick. I'm confused. Could my period be pregnancy bleeding? Or could I have a bug. I'm going to get a test soon. I'm just asking for opinions. Anyone experience this?