Miscarriage or tissue or what?

I know I posted this in another group a while ago but my doctor(who hasn't seen the pic bc it was a quick appointment) said hopefully it was just a fluke.

Was my second period after getting a hormonal IUD and was heavier and clottier than the first I had with it.

Period was a week late, but had negative test after it was already 3 days late. Was kind of rubbery??? And couldn't tell if the ball thing on the end closest to the camera was yellow ish or not

I can't find peace of mind from it and it's nagging me. Previous forum posts said it was just tissue passing from the IUD.

Help??? I don't want to be pregnant ever in my life (hence the IUD til permanent Sterilization is an option) but if it happened once it could happen again.