I think that every woman's situation is unique when it comes to caesarians. (as with pretty much everything else!) But I can tell you that my mother has eight children and we have all been delivered by caesarian. Apparently Ethel Kennedy (US president's wife, back in the 60's, I think) had 11 kids by caesarian. So don't let the dr or midwife tell you that more caesarians is never a good idea. It totally depends on your own body! It might be absolutely fine in your case, and it might be an increased risk. Inform yourself on the pro's and con's, and risk factors, and speak to other dr's and midwives, and make your decision, with your DH.
All the best with this pregnancy and delivery!