Thanks for query
You didn't mentioned whether you had normal or caesarian delivery.
Early caesarian scar may give rise to incisional hernia
due to vigorous coughing.In incisional hernia you may feel the bulging part during straining. You should consult your surgeon. you needs proper clinical examination.
For cough, you may take proper antibiotics first.
Investigation like Ultrasound
of abdomen should be done.
Get well soon.