I took plan B instantly after having unprotected sex. He did not come inside me, but I wanted to be safe. I received a period with normal flow later on so I thought I was alright. My next period was irregular and was very light, like a brownish substance with only a little blood that lasted about 5 days. I dont like being irregular so I started birth control later to have regular periods every month. I wont be expecting my period for more than another week, but I've been driving myself crazy with worry because I dont know what that last light period meant. Is this normal for people who have taken ECP? Please help.