How soon after stopping Prometrium would I start my period?

I am on day 31. I am taking Clomid days 3-7 to ovulate, and then Prometrium on days 18-30 to thicken the uterine walls to aid in implantation. Because of it keeping the lining there, i wouldn't have a period until i stop the meds. I stopped last night and now i either have to wait for a period or to see if i'm pregnant. My nipples have been tender for a week now and i sort of feel like i could start. (when i was pregnant in may (miscarried) i felt as though i could start at any minute). Just wondering if anyone had been on this drug and how long it took to see if they were pregnant or to start their period (if i ovulated this month...based on an ultrasound, it wouldn't have happened until day 20). Thanks.|||It is unusual that your dr would have you take the prometrium without first verifying ovulation with basal body temping. Generally, you take the clomid, chart your basal body temps, and after you get 3 days of high temps you start on the prometrium--but I'm sure your doctor has you doing it this way for a reason. Also, it is recommended to take a pregnancy test at 14 days past ovulation before stopping the prometrium and if neg. stop the drug but if pg. continue the drug til a blood test can be done to verify high enough progesterone levels. It generally takes 3 days after stopping for your period to come.