late AF

AF hasnnt showed up at all!! My lmp was on July 4 since then nothin I took a hpt it came back negative last week I took a blood test negative again. Doc gave me provera I already finished all 7 and no sign of her showin up!!! Please help what do I do. Should I take another pregnancy test!?! Someone please help doc Jst wants me to wait and I hate waitin!!!