Am I pregnant??

I had a miscarriage on March 10 2009 I was only 8 week along but it still hurt me. (emotional, and physical) I  didnt have a period until July 9 2009, then one in August 9 2009 and now I havent had one since, it has been 9 weeks now.. About a week ago the my nipple started to get really sore to even touch, they are not so bad now, but still sore along with a little nausea just out of the blue during the day at anytime. and this week I have been having a little cramping in my lower abdomen, and I think when I just went to the bathroom when i wiped there was a little brownish blood. I keep getting neg HP test.. But could I still be pregnant? Please help....