I agree with Allie, I had an IUD put in when I was about 17 or so and I had never given birth and it was inserted just fine. I also had one inserted after my C S and had no issues with insertion. Definitely find a new Dr.
I also agree with Allie, I’d find another doctor or at least get a second opinion. I know Mirena is a little different but still goes through the cervix, I just had mine placed and I’ve had 2 c-sections with no vaginal delivery or even dilation during pregnancy.
I've never given birth vaginally and I had the coil inserted when I gave birth to my 3rd 5 weeks ago?..
That’s… really weird. Because you can have it inserted even if you’ve never been pregnant before meaning obviously your cervix isn’t open. I would find another doctor