Girls, maybe someone had this experience: you're walking, everything i…

Girls, maybe someone had this experience: you're walking, everything is fine, and then it starts to hurt sharply, either the right side from below or the left, almost on the ribs. Sitting is painful, if the right side hurts, then even lifting the right leg is painful, with the left side too, it passes after some time. It's like a baby pressed something and holds on, I don't know how to explain it) but at my due date, the baby is still small))