help!

TF

last mc (5weeks 2 days)i had severe pain and bleeding for a few days... hcg was confirmed at 12... today i had bleeding for a few hours bright red no pain at all... hcg at 15,000. i’m 5 weeks 5 days today. took a test when i got home from the ed and it’s still super positive... they said all they saw on the ultrasound was what looked to be “pooling blood” my discharge papers say “miscarriage pending”... i just don’t understand. i’ve only got pink spotting now that’s pretty much non existent. i have so many questions as to why this was not painful at all and why i’m not bleeding for days if i did miscarry. 😔 anyone’s stories or advice is much approachable.