Movement Sensation In Abdominal Area, Burning Sensation, Started Bleeding. US Negative. What Is Going On?

hello, i ve been feeling sudden movement in lower abdomen like my womb area. It comes and goes. I was pregnant early this month but lost one morning after a long hard body stretch- felt a burning sensation on my lower right abdomen and suddenly started bleeding. That s exactly 8days today. However accompanied my pregnant cousin to one of her preg stuffs, kinda therapy and the lady that attended to her offered a tommy massage and she touch my lower left tommy and said that i was pregnant but i had a blood test done after but it was negative and have already had an ultrasound the day i started bleeding(hoping the preg was still there) which showed nothing. I just keep feeling the sudden movements, like a heartbeat , some times it beats three times within a sec.