I took plan B on a monday due to a broken condom (I ended my period on that Saturday before). The Friday of the same week I began to have a spotty period and it was fairly light (I wouldnt call it a period because theyre usually heavy for me). the next Monday, which is today, my period ended and I had unprotected sex. I was not planning on it and I know plan B should only be used in emergencies, but I wanted to know if I can still use plan B just to be safe I wont become pregnant. Will it lower the chances of plan b working if I use it exactly a week after?