My clinic requires everyone to have a water sono before they do IVF. I was teriffied before I went because I had recently gone for a HSG were they inject the dye to see if your tubes are open and that was not fun!
The water sono is different. It was very quick and I really didn't feel anything. I think it took my Doctor about 10 minutes. The uterus is just filled enough with water so they can see on the sonogram if there are any abnormalities that would prevent implantation. When you are done the water just drains out. Why would they think you have scarring from your c-section? Did you develop an infection after?
Try not to be nervous....I know it's hard! This is actually a good test for them to make sure everthing looks good. Let us know how it goes.