on and off heavy bleeding !! please help

Marie🤰🏼💙
Hello, I'm 13 weeks pregnant and I woke up during the night noticing I was bleeding severely. I had bled through my clothes and even the blankets. I then rushed to the washroom to notice I was still bleeding pretty bad and I then woke up my boyfriend and we went to the hospital. They did blood and urine test and an ultrasound and told me everything was fine and the heart beat was still strong and sent me home but it is still happening and they just keep saying the same thing please help I'm really scared . Suggestions anything helps