Is this normal? How many have experienced this?

Monay

So yesturday i started bleeding like i thought i was peeing on myself but it was blood dripping down my leg so i went to the hospital and they did a ultrasound and baby is health and completely fine but its scary to me becuase i thought i was having another miscarried but i wasnt the doctor couldnt even tell me exactly why i was bleeding becuase they didnt know