Bleeding during early pregnancy?!

Hello lady's, has anyone bleed during the beginning of their pregnancy? I just found out I was pregnant 3 days ago, I started what I thought was my period on the 7th but was lighter then usually.. (still spotting now) I didn't think nothing of it considering I'm bleeding lol well I went to the ER and they told me it could be a threaten miscarriage, they also didn't have any ultrasound equipment so I just went home. Question is, has anyone bled and continued to have a healthy pregnancy ?

Advice to ease my mind please 😔