For the last two months I haven't gotten my normal period flow just on and off reddish brown thick discharge. Yes, nasty and a complete mess! It's not a lot to fill the whole pad what's so ever just a few spots here and there. I've been having unprotected sex for these three months as well with my husband of course. I also get cramps that give me nausea and lower back pain, kind of lightheaded off and on and headaches... Could I be pregnant?