To clarify, are your kids going to be 12 months apart? My OB told me the minimum recommendation was 12 months between birth and the next pregnancy. It was 11 months between the birth of my first and my second pregnancy and while she wasn't ruling out a VBAC, she highly encouraged me not to do one. That pregnancy ended in a miscarriage, but my second child was born two years after my first and for that birth, my OB was then very supportive of a VBAC. What was interesting though is my friend was seeing another OB in the same practice and he told her the new recommendation for spacing was nine months (her kids were 18 months apart).
If you want a second opinion, you can surely see another OB. However, based on my experience, I would make sure the other doctors in the practice and the hospital are supportive of VBACs. Again, my OB was SUPER supportive of my pursuing a VBAC even though I actually wasn't the best candidate. She wasn't on call the day I went into labor and the nurses I saw and the OB on call did not seem to be as supportive. Both my husband and I felt like they had written me off as a repeat c-section and were not supportive as I went through a difficult labor. When I told my OB my experience after my son was born, she admitted she was afraid that was going to happen! I wish I'd asked her how supportive everyone else would be and if she had any concerns if she wasn't there. And I wish I had had a doula to advocate for me. I went in very confident about the care and support I'd receive based on how supportive my OB was, so I never considered a doula. But when I was pretty much paralyzed with a long and difficult labor, (as was my husband who was just shell-shocked) I wished I'd had someone on my side. Because I didn't feel like anyone at the hospital was on my side.