I think it might depend on why you had your last c-section. There's a lot of doctors who refuse vbac because of the apparent risk. Statistically, 60-80% of women who try VBAC are able to deliver vaginally, but you have to make sure you're able. If they did your last c-section in a certain way it may not be possible. If it's something you want to try, ask a few doctors and see if you're a candidate for it.
why is it that you have to do a csection??? I know alot of doctors will not allow a woman to try a VBAC if the hasnt been alot of time between csections and the scar tissue isnt healed properly. But other than that I would talk to your doctor.