I had the SAME thing with my c-section with my first baby. I had a c-section after 20+ hours of labor for failure to progress.
After I was home for about two days, 'stuff' started pouring out of my wound. It was gross. I went straight to my OB. I had two sections of my wound that opened and werent healing.
Its partially my fault. I did NOT follow drs orders regarding taking it easy after my section. I was driving, taking the baby everywhere, and going up and down stairs.
Anyway, we had a home health care nurse come over and show my husband how to pack the wound. We did it twice a day I think, and then once a day.
I never had a wound vac. Not sure what that is.
Anyway, it healed in 6 weeks. My last appointment with my OB was two days before my healthcare ran out. (I only had it for prenatal care, and then 6 weeks postpardum.)
During the this whole process I saw my OB more than the entire time I was pregnant. I was in there twice a week in the beginning and then once a week until it healed. I guess they were keeping a close eye on it for the chance of infection.
Take it easy. Spend lots of time in bed with baby.
If you have another section, make sure you remind your dr of the troubles you had healing. I had staples the second time and that pressure bandage stuff. And, I took it easy. I healed without an issue.