It raelly depends on the reasons for your previous c/sections and how long ago they were, the types of incisions used and how well you healed. The ACOG recently released less restrictive guidelines for VBAC's, including those after 2 c-sections. do a google search for ICAN online and check out the website. It has some pretty good info on VBAC's. Also check out the ACOG's website for their release on VBAC's. I have had 5 VBAC's after 1 cesarean. The biggest problem many women run into are doctors who don't like to perform VBAC's becuase they don't like paying the higher insurance premiums. Or simply becuase it's more "convenient" for them to preform a c/s. Your doctor can do a risk assessment to see what your chances would be.
If your previous c/sections were for reasons that are likely to repeat (such as baby being too big for birth canal or stalled labor) then you wouldn't be a prime candidate for VBAC. However if the reasons were something not likely to repeat ( like low amniotic fluid, breech presentation or elective c-section) then you are more likely to have a successful VBAC.
theres about a 1% chance of the uterus ripping open. The problems is alot of Dr.s like to to repeat csections even though the the risk of the uterus opening is so low.
as far as i am aware, there are no risks after having ceseareans. unless it was for health reasons for the last two pregnancies. well done for choosing to go natural :) hope the birth goes well for you