Someone help me?

First let me say I had my tubes tied in Feb 07 My periods are always regular except for this month it was like 6 days late. I took an Hpt 2 days ago and it was neg then I started bleeding, well I thought ok its my period but like an hour later I had completely stopped bleeding, What is going on I am only 26 so I don't think it could be menopause I am still cramping but nothing is coming out.