02-09-2011, 06:33 PM
The same thing happened to me! I started PM last month and took it for 15 days from the first day of my cycle. My period was shorter and lighter than usual, then I got my period again like 3 weeks later. Usually I get it every 5 or 6 weeks! I was worried it was spotting too, but I don't think it was. Maybe PM just makes your cycle really short.