I had rib pain on the right side also but it was mainly in my back not front. Turned out that the pressure of everything moving up to accommodate bump has caused 3 ribs to dislocate. It was probably my biggest aliment during this pregnancy as I could not escape the discomfort. Eventually when bump dropped the discomfort has backed off. But as for a specific sharpish feeling in the front. Turned out to be bump pushing the heel of his foot into my ribs, caught him doing it on one of his ultra sounds. Cheeky little thing!