Something weird has happened to me plz help !!

So yesterday I had red bleeding so I went to the ER, one week before I had the chance to hear the heartbeat and it was around 179.

When I went yesterday she saw the baby but we couldn’t hear the heartbeat instead we saw the baby’s heart bumping (moving) in the ultrasound I hope you understand what I’m saying!

She said that it’s normal since she is seeing the heart bumping but I don’t know, do you think their device wasn’t working well ? ( It is different hospital than the one I heard the heartbeat in )

Did anyone had this before!

Please help I need any one to ease my mind.