6 months post-- port moved??

I had my Lap Band surgery done in Feb. of this year. Everything has gone great, however this past week I have been uncomfortable. I used to be able to distinctly feel my port under one of my scars, but now i dont feel it anymore. My left ribs have been feeling like something is rubbing on them and my left side has felt irritated. Has anyone heard of their port moving?? Is it possible? I've been doing more exercise this week such as baseball which has involved more of my stomach muscles and twisting... I called my on-call doctor but no return call yet..

Yes a few months in my port did move,as rolled over it rolled up and stuckup, had it repositioned 3 weeks in went to the doc and he said that it moved away from the stitches again, now had redone 3 weeks ago - oh gosh really hope it stays put now, doc said was nothing i did could of moved due to my weight loss, got second opinion he said the same.