This happened to me at 36 weeks. It was horrible. My mw was ok with it, but the back-up OB was not, nor was the hopsital. After about 1 1/2 weeks of worry, they finally agreed to do the VBAC, but my mw couldn't accept new patients with single layer sutures. The risk of rupture increased about 4% from a double layer (still less than a 4% chance overall, though) and I was supposed to sign something extra, but never did. Apparently, single layer sutures were the standard of care until about 1-2 years ago around here.
I ended up with another c/s, but the OB told me she did a double layer while we were in the OR, so I hope that means she is ok with VBA2C!