C-Section Question????

Has anyone ever been told that they have to have a C-Section because the doctor thinks they are too overweight? I weigh 260 and have gained about 45 lbs and this is my first pregnancy....everything else is fine with me and baby! I was already a diabetic and so they put me on insulin but I have done great with low sugars and diet....just concerned that there should be another reason for them to make me have one????