Wash your hands really well, then feel the area of and around the incision, if it's hotter than the rest of the under body it might be infected. Check to make sure the site is fully closed, but still keep your appointment with the vet. Hope everything is alright.
Cheers Quad
__________________
Assume Nothing, Question Everything, Start Thinking!
RIP Megan 3/1998-5/28/2013