Second pregnancy: baby movements after a c section?

I am almost 20 weeks pregnant with my second baby. I had an emergency c section with my son. I have just started to feel my baby moving, but sometimes the movements cause sharp pains in my abdomen beneath my scar tissue. Also my bump seems to be 'cut off' by the scar – it starts above it.
Is this something to worry about? Will ask midwife at appointment on Monday, but just curious for now?