Do you normally start your periods on your own or do they usually have to do provera?
How many days past ovulation are you?
Have you passed up your luteal phase time?
All of the above things are important factors here....
Typically though I would say that if you haven't started you period yet then YES there is still a chance. Wait a week and if you still haven't started see your doctor for a quantitive HCG test.
at 12:50 PM on Dec. 6, 2010