I had my period start on Feb 12th and end around the 16th. I had sex on the 18th and the condom broke without us knowing and he went inside me. The next day (19th) I took Plan B. A week later on the 22nd I got what seemed to be like a period but brownish red and a little different and lasted only a couple days. We had sex again without using a condom and we may have slipped. My question is do I count what seemed to be like a period on the 22nd? Or... Do i count what my usual period day is..the 12th. (I am refuring to my march cycle. I need to take a pregnacy test to make sure I am not and I don't know the day of my "missed period".)