Subchronic hemorrhage

I was spotting blood clots and thought I was for sure having start of a MC but went to ER to find that it was a bleed by placenta. I don’t have any prints of the ultrasound but it was odd to me that the ultra sound tech was trying to find a heart beat inside of them hemorrhage. She did find that the baby was fine and had a healthy heart beat of 170, but why would she look for a heart beat inside of a bleed? Does anyone know or experienced this before!? I’m 9 weeks pregnant and nervous about this it does increase your chances of MC.