Okay so I took plan B about a month ago because the condom broke, about 3 days ago I got this brown discharge with some light blood, it lasted for like 2 days and it stopped but it was like really heavy the second day but it was brown, and I thought it was my period but it wasnt, because it stopped. And I was suppose to start my normal period today and I took a pregnancy test and it was negative. Any help explanations? Im not trying to get pregnant so yeah