First miscarriage

I have a few questions... please no rude comments this is my first miscarriage and pregnancy

I miscarries after seeing a heartbeat at 9+5, is there any reason this could happen specifically or is it just out of my control? I feel like it’s something I did seeing as the rates of a miscarriage lower significantly after seeing a heartbeat

I had a d&c on Wednesday and it’s now Tuesday, still bleeding from it, does anyone know how long this bleeding will last ?

My hcg was 1,700 8 days ago before my d&c. Does anyone know how long it takes for me to get a negative pregnancy test?

Any success stories of having a miscarriage and then getting your rainbow baby would be appreciated also.

I have a appointment on December 6th so I will be asking my gynecologist everything but I would like your personal answers. Thanks in advance!