Colmid and a miss period

I took clomid 100mg Cd5-9. I was expecting AF on the 8/24. Today I'm a week late, but negative pregnancy test. Is it to early, or is my hormones off from the medicine? The Dr. Prescribe provera to start my menstural back. If it don't start in two wks to take another pregnancy test. Have anybody experience this and if so what was the outcome?