your right ovary is on your right-hand side.
An ovarian cyst as such does not cause pain, unless it gets infected, or there is bleeding in the cyst or if there is a sudden increase in its size. The pain that you are describing can be due to multiple reasons, most common f which are muscle or nerve pain. While doing a C-section the nerves in the abdomen are cut and the pain can be due to that. If the pain is more near the C-section scar, that this is the cause. Muscle pain can be caused by any surgery, and C-section is a major surgery. Combine the muscle involvement with the lack of sleep and hormonal imbalance after C-section, the pain can be intense in some people. Other rare possibilities are infection, internal bleeding etc.
I would recommend you to rest and take a mild pain killer. If the pain persists, then see your doctor. You might need a first-hand examination and investigations like an ultrasound
I think that sounds reasonable,
All the best,