Your retina was treated following its detachment with scleral buckling along with Cryo/laser. Your retina is now attached and all the predisposing factors are taken care of already. Hence, unless there is a new predisposing lesion it shouldn't re-detach (irrespective of pregnancy/mode of delivery).
So basically you have nothing to worry about
Next Steps
You could however go to your treating Ophthalmologist for a screening (before your delivery date) for any new lesions followed by its treatment (if anything is found)