Causes of pink discharge?

I know really the dr/nurse is the only one who can answer and i have a scan and appointment on Tuesday. Can anyone advise from experience or that may know, what causes pink/brown colour in discharge. I dont know how far gone i am as started bleeding and had early mc 6 weeks again (stopped bleeding 5 weeks ago) they confirmed i was no longer pregnant and then i had another test. Had bloods done and my levels are almost 50,000, which im not sure what that means as such but she said its good. I have been having pink/brown discharge on and off. Maybe like 1-2 times a day every few days (it doesn’t last long as all)

Anyone hd this, also any idea how to guess how far gone i am roughly until my scan tuesday?