The first month that I was on otc lo I started spotting the night of my last active pill, and then it kind of stopped for a couple of days, until monday, and then it was like a heavy period the rest of my inactive pills. It is totally normal to have this though. It is just your body adjusting to the lower dosage of the hormones, by your second month it should be pretty normal. For instance, I do not start my period until the wednesday of my inactive pills, instead of sunday, when you are "supposed" to start.