pain... any doctors or nurses?!?!?

I'm three and a half months postpartum tho I don't believe this has anything to do with this. When I press on my lower left rib cage, more or less the last one, I feel a bit of a pain almost like a small stab in the middle of my abdomen..... It's a bit of a concerne for me... If anyone knows what this might be and what the cause might be please reply... Thank you so much.