HI, i have taken provera twice now, the first time i got af within 2 days and this cycle i got af within 6 days, so dont worry. I was also told it can take up to 14 days, stress could be delaying it so try not to worry, i know its hard especially when you are waitng to take you first round of clomid.
Try to be patient it will happen.
Take care & good luck
leet me know how you get on
Louise