Port Detached?

Hi everyone! I have been banded for nearly a year now and so far it has been a great experience. Yesterday though I noticed a bump up under my ribcage where there wasn't a bump before. I felt around my belly button where my port normally should be and I can't feel it. So I'm wondering if my port has somehow become detached and has moved up? Is this possible? If it is should I make an emergency appt with my dr office or just wait until my next visit (in 4 weeks)? There is no pain...just a freaky bump on my rib cage!

Thanks for any advice of info!!