Pregnant or period?

I'm pretty sure its my period, but I have been very nausus, and my acne is BAD! it doesn't get like this i'm wearing make up because its so bad, and I haven't had no cramps this is the first month I haven't been hurting, or cramping or anything, my period is in 2 days, and I have been having a cold this month so far, what do you think?? And I was told if you get pregnant and take a ovulation test its positive, so I toke one and it was negative because I don't want to set my self up for a neg preg test,