Height doesn't matter when it comes to babies, there are plenty of women in other cultures who are small in stature that have given birth to large babies. There is no way to observe via ultrasound whether or not your pelvis will fit your baby, so I don't know how your ob came to that conclusion? And I have also known plenty of women who's babies haven't engaged by 34 weeks?

I was told I would never birth my children as my first baby was born via "emergency c/s" which I strongly believe was unnecessary, and purely out of convenience. My second baby I was told I would never birth due to the size of my babies and my apparent pelvis size. My son was 9lb 11oz and I birthed him without drugs and no tearing.

If you want to work towards achieving the birth you want research it, its not about the size of your pelvis or baby, its how you birth your baby that will have the biggest impact on the outcome of the birth.