Provera and have questions possible pregnancy?

My period for June was 16-22.. my doctor put me on Provera to start in July because of irregular periods and because of PCOS.. well my July period was July 7-16 and if i had not taken the Provera I should have ovulated around the between the 9 and 11th. Me and my husband actually b danced around the 13 because we thought i was done with my period. I spotted on the 19th of this month. My question is could I have ovulated on time even though I was on my period because of me taking that pill. And I was making my body have a period early? Reason I am asking is because i have been nauseated today and have been really tried the last couple of days and was wondering could I possibly be pregnant and gotten pregnant on my period