Generally , one should always have about 2 years space between deliveries , but that goes for any woman , not just vbacs .
There is an old midwife´s saying " it takes the body 40 weeks to be pregnant and 40 weeks to become un - pregnant again "
It is simply too draining for the system , if pregnancies are too close to each other .
That said , I had my first ( planned and necessary due to fetal malposition ) cs in 97 , then got pregnant despite birth control about 5 months after that and even though , I ended up having another one because my baby got stuck on the way out , never had any problems with my scar .
Then got pregnant , when number 2 was 1 year and 6 months and had a normal , uneventful delivery and another one 3 years after that .
Third cs in 2010 , due to a horrible finnish hospital doing EVERYTHING wrong , one possibly could and ending up with another cs because of fetal heart problems .
Got pregnant exactly 9 months after that and just had a wonderful and absolutely uneventful delivery , without my scar acting up even once .
So , anything is possible , but the longer one waits and gives her scar time to heal , the higher the chance of things going well , of course