What Causes Stress Urinary Incontinence And Stomach Pain After Having Intercourse?

bit of a personal problem, so i v had 2 children and since then iv noticed when i cough or sneeze i pass urine a little, i did all my pelvic floor exersizes after, and also a feww weeks ago after sex i had a crippleing pain in my tummy and the only way i can explain it is the inside of my vagina was hanging out! it was very painful more in my stomach and fortunatly the inside went back in through the night, is this a prolapse? im only 23 and will i need an opperation?