Help! my stomach go back to normal

Patient: I have had 2 children by c-section aged four and 2 and work out quite a bit but latley my somach has swollen up the lower area and tender on the lower left side i am not prgnant but was wondering what might have caused the swelling as it is very obvious i look pregnant and i am generally a pretty toned person so i dont no whats wrong i also feel bloated all the time?

Doctor: