I've had a csec, it's been 19th months now but i feel pain on my stitches sometime, is this normal?

There wouldn't be any pain on your stitches especially after 19 months, so I do suggest for you to see your gynae if the pain persists. A friend of mine had pain even after her child was almost 2 years old, and it turns out that she had endometriosis at the incision. She had to go for surgery to remove the knot and had since felt better.