C section scar

Hey ladies, I need your opinion. I went to the doctor back in May because I have a pain in my c section scar. So they told me it was scar tissue and dismissed it. Two months after I got pregnant ( Twins) and end up in miscarriage with D&E. We did testing and everything was good with me. I got green light to try again. The same thing happened again ( Blighted ovum). They test the gestational sac and it was normal. Now after the last D&E my c section scar is hurting a lot and while before was only during periods now is constantly.

So they finally listened and I got an ultrasound. They found a lump on my scar. It could be endometriosis.

FYI--- I had 3 healthy pregnancy before ( I have 3 healthy boys).

Do you think that the c section scar tissue could have been the factor of my miscarriages?

And do u think if they would have listened to me at the beginning I wouldn't have gone through this pain and emotions?

Do you think it was negligence from their part?