Questions oh questions

Emergency contraception, spotting, and periods is what this is about.

I took Plan B two weeks ago today because my boyfriend came inside me the day before my fertile window. Today I had cramps and a dark brown red discharge. Not too long ago something black came out and it looked like the egg but I'm not too sure. The bleeding is very light so I'm torn between knowing if I'm spotting or if it's my period. Any comments on this one?