Random by way of I don't get nauseous before or during my periods.

I had a positive opk July 26 pm and believe I ovulated on the 28th then on August 5 I started with nausea very mildly.. then on August 6th I got my period which was about 5 days early but I've been constantly nauseous this whole time. It ISN'T a normal symptom for me but I was wondering if it's normal in general or should I get evaluated? Please help!