You cannot really get a slipped rib. You can break or fracture a rib or slip a disk in your back but you can't slip a rib. You should go see a doctor though if you are having pain in your ribs.
I think when you had that kind of ailment the symptoms are most likely are difficulty in breathing,uneasy,sometimes you feel pain on that area.I would suggest to see a chiropractor.
When one has slipped rib the main synptoms is pain in the back, chest or stomach. There will be sharpaching pain which will be a pain like a deep cut and one will be finding hard to breathe.