Welcome to Allnurses, okwilk~
We're usually very happy to answer questions here, but we can't really give answers that could be construed as diagnoses. As a nurse, I'm confident that you understand that.
I can only suggest that if you have a concern with your port-a-cath, as with any other medical situation, that you contact your healthcare provider and have it checked out.
And please, come back and post often. We're always here for you

and we can offer up moral support like crazy.