V.N.
Can you walk on your lunch break, weekends, early in the morning? I would start 1/2 hour 3 times a week and work your way up. If you can't do 1/2 hour at a time break it up into 15 minutes.
Also Pilates is amazing and you can do it post-c-section. I would recommend a private instruction before you do it yourself because it is really important to have proper form. It can really shrink your figure and strengthen any core damaged by surgery.
Once you get comfortable with that I would recommend a gym with fitness classes and try to go on the weekends and a few mornings before work.
Good luck and congrats!