I had my period on the 4th of November and then had protected sex on the 17th of November, he came in the condom but the condom was not leaking when he pulled out, and when he took it off. I still took a Plan B the next day before 24 hours passes just so Ii can be sure of it, on the 28th i started getting cramps and feeling as if my period was going to start but it still hasn't, today I have had brown discharge is this normal or should I be worried?