I have Provera 5mg. I have super bad periods that knock me down for 2 days straight, no matter what. (This occurs on day 3 and 4 of my period.) I'm due to start my period on anywhere from the 14th-16th of this month. I absolutely cannot take off 2 days of so I got Provera. Not sure what day to take it on, and how many to take per day?