Back pain and some dull sensations in my stomach, maybe a spasm or som…

Back pain and some dull sensations in my stomach, maybe a spasm or something like muscle tension. They can be for a few days, then disappear. But not constant, for example they started at night today. I don't even know what it is anymore. Maybe the uterus is growing? Or maybe ligaments? By the way, I had a cesarean section 10 months ago.