Thanks for the query.
The possibility of post-operative infection is somewhat rare as usually the surgery will be performed in strict aseptic conditions.
But as you are having some problem with the sutures, once consult gynecologist and get examined if there is any post-operative wound infection
If needed go for one ultrasound
After ruling out these possibilities once go consult general physician and get examined to find out the cause for fever
and take treatment accordingly.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429