9 DPO Nausea

Today I'm 9 DPO. Really don't know when to expect my period. Last month was a 27 day cycle. This month, could be any time lol but today, I have felt soooo nauseous. No vomiting yet. By this time last month, I was already cramping and hurting in my back, because AF was just around the corner. I've had nausea most of the day today. Other than that, no symptoms of AF or of pregnancy. A couple of days ago, I had a really weird sharp pain near my right ovary which is also the ovary I ovulated from. Anyone else have nausea at 9 DPO? MAYBE a sign??