Asking for advice again!!

The first day of my last period was August 5th. I don't have the normal 28 day cycle...they range from around 30-35 usually. I am currently on cd 55! I've taken several hpt all of which have been negative. I have no pregnancy or period symptoms. So I called the dr and they did a pregnancy test which turned out negative (as I expected it would) I had requested a blood test which they did not do. She prescribed me some provera to start my period but I don't feel comfortable taking it without knowing for sure if there's a chance I could be pregnant. Anyone else have this problem? Oh yeah and the last we had sex was August 31st...I don't keep track of if I'm ovulating or not but it was in the timezone that the app said I could be ovulating. A couple of days prior to that I had spotting for two days which stopped. It was unprotected