I have had 4 c-sections and my 5th is planned for the last week in July. One of my OB's did tell me that the risks do go up signficantly for things like uterine rupture after the 4th. However, I've also been told that with the 2 incisions I have (they used each one twice so far), I have very little scar tissue and while my uterine wall is a little thin, it's not bad at all. I saw her for the first time during this pregnancy on Wednesday for my regular pre-natal appointment and she quickly brought up sterilization. I told her it wasn't an option and she seemed pretty cool about it, but still warned me of the increased risks.
I have 2 years & 3 months between sections #1 and #2. After losing a 4 year battle with secondary infertility, giving up, having gastric bypass, a total hip replacement & starting college at age 30, our 3rd c-section came 8 years & 6 weeks later. C-section #4 came 16 months later. The time between sections #4 & #5 should be 2 years & 5 months.
Over all, I had a bad experience with an epidural with #2, so I only do spinals now. With #4, my incision opened 6 days post-op, but I am known for being a poor healer & it's not the first incision I've had open up on me (but it is the only c-section incision to do so). Besides those 2 instances, all 4 have been great and the healing time seems to get shorter and easier.
To date, I have not had any complications during a pregnancy or with my body due to the number of sections I've had. I really don't worry about complications because my OB's have done such a great job on the previous sections.