Miscarriage help?

I found out I was pregnant august 31st. 3-4 days late for my period. I started spotting that afternoon and have been bleeding since. I bled for 7 days. Day 7 and 8 spotting. Then bleeding picked back up again and cramping. I had a vaginal ultrasound and they saw nothing. Said my hcg levels are low and do believe im miscarrying. Today is day 16 that I’ve been bleeding and I’m bleeding a bit more today compared to the last few days. Bleeding has picked up I’d say. I was only 5 weeks or so when I found out I was bleeding and was 6 weeks at my appt.

Why am I bleeding still? Should I be worried about an ectopic or something else? 16 days of bleeding is a lot. And it isn’t slowing.