08-10-2011, 09:26 PM
Marcy, I have read varying suggestions on when to take PM. Some sources say to start on the first day of your period & continue for 15 days. Other sources say to start on the last day of your period. I am going to start taking PM in November, and I'll be taking it starting on the 1st day of my period. I wish I had more information or experience to share about it, but not yet...