A lot of doctor's don't let you do a v back becaues of the risks. I had three c sections on my second I ask for a v back I was told no. Its up to the doctor if they let you. Good luck with that
have you met a doctor that will agree to it? It's more risky and much harder to find a doctor willing to do a vbac when you've had more than one, definitely talk with your doctor about the risks either way, good luck!!