What Causes Moving Feeling In Abdomen With Heavy Vaginal Bleeding?

I had my tubes tied in 09. But lately I have been feeling small movements in my abdomen. I have 4 children and the feeling is the same. I have been bleeding for the past 3 weeks heavy. Big huge blood clots. Please give me some advice. I keep reading that it is just gas, but when I move "it" moves. After the doctor pushed down on my stomach, a few seconds later I felt whatever this could be move again. Please help me.