Can a gynea mri scan miss cancer?

Hi everyone, I find myself back here because Iv been so unwel this year and worried something has been missed.
So to narrow things down this past year Iv had phases of lower severe abdominal pain,
Back pain which is now constant
And this heavy pressure feeling that’s worse at night
Iv developed constant acid reflux
I also have a swollen lymph node on my neck
I have to have b12 injections every 3 months now as they wer so low. I’m constantly fatigued and my quality of life isn’t good. I paid for a private mri scan with contrast I was convinced they were going to find something but again nothing. I’m honestly so scared that whatever it is is getting worse as the pressure and back pain is now constant :(. Do I push for a colposcopy? I am seeing the gynea today so I guess I just need to keep pushing for answers as you know your own body and you know when something isn’t right.
Thanks for reading x