Hi Sher, well I say follow your heart and it sounds like your heart says you want a VBAC. I am due on May 15th and was having the same dilemma as you, I had my twins by c-section and this time my baby is transverse so it looks like it is going to be a c-section again. My twins are 22 months old and I worry about not being able to pick them up afterwards etc etc, so I am trying to get them used to climbing into their highchairs, cribs etc so I don't have to pick them up so much and then getting them to cuddle me on the sofa.
I have heard too that you shouldn't be induced when you have had a c-section before as it can increase the likelihood of rupture.
My doctor told me that I was twice as likely to rupture as another person doing a vbac as I had twins and am having them close together, he said it is only a 2% - 4% chance for me, but it all depends on how you see risk and I feel like that is too high for me considering what can happen.
I am going to go for a trial of labor I go into labor before May 11th but only if it feels right and if not then I am going to go ahead with the c-section on May 11th.
I wouldn't worry too much about the size on the U/S as they are very often out with that, they were 1lb out with each of my twins. I also witnessed my twin sister give birth to a 9lbs 13oz baby and a 9lbs 9oz baby and she is tiny. She was just fine. So, I think you should follow your heart and do what feels right for you.