I have Crohn's disease and have had bad pain like that. I also have a huge inoperable hernia so the intestines move easier when digesting foods and I will get twists in the bowel that can cause a partial bowel obstruction. It can be uncomfortable.
But, when I was five months pregnant with my first child, I had the pain you were describing. I would feel fine and then it would hit me and I would double over in pain. (The bowel problems don't do that to me.) Anyway, I was teaching at the time and I would leave the room, stand in the hall, and "jiggle" my abdomen and the pain would subside. This went on for about a month and the obgyn wasn't listening to me.
Finally one night it happened again and no matter how much I jiggled my abdomen, the pain continued. My husband took me to the ER and after many x-rays and even a kidney scan, they ended up doing exploratory surgery. I did have an ovarian cyst that was 10 inches in diameter and weighed 4 pounds and it was causing my ovary and fallopian tube to twist and it was a dangerous situation. They removed the ovary and fallopian tube and I felt fine. I just prayed the last four months of my pregnancy that my child would be fine, and she was perfect.
So, if this happens again, you might want to check with your gynecologist to make sure there isn't a cyst going on there.
Fibromyalgia, Crohn's Disease, Ostomy, Autoimmune Inner Ear Disease, Diabetes, Osteoporosis, Glaucoma, Scoliosis
God does not give us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7