4 days ago I had unprotected sex. I am recently got the birthcontrol implant removed in my arm around august 2013. I am currently on no birthcontrol. I have taken many ovulation tests but all say negative. I m not bleeding or spotting. I normally have already started my period by now. I have had cramps for a day but it only happened once. I now have brown like stringy mucus stuff and it has a odor to it. What s going on?