6 days late, then 2 days of bleeding, now spotting, could I be pregnant?

[tjcca5]

I am 37 years old and have had my tubes tied for almost 14 years. About a week before my period was due I had light cramping in my lower pelvic area that lasted 2 days. I have been tired, nauseous, bloated and eating more. My period was due on 11/30. I took 2 hpt on 12/4 and both came out negative. I finally started bleeding on 12/7, it was heavy and only lasted 2 days. By the end of the 2nd day it stopped. I didn't bleed at all on the 3rd day. Now today 12/10 I am very lightly spotting when I wipe. As the day is going on it is turning to brown spotting. Is it possible that I am pregnant?