I had sex with my boyfriend about two nights ago, and noticed that I had bled a little bit, however it was a brownish color. I'm on the mirena iud, for about 3 and a half years. Never had a period on it until about 6 months ago, it was pretty regular since i got them. I was supposed to get my period on Dec, 4th but never did. Then about two nights ago, I bled a little after sex ( a brown color ) haven't bled anymore. I've been having minor cramping, and I've been super tired, and moody the last week or so, what's wrong with me ? Am I pregnant?