Hi Art:

Yes, do go to the doctor who put it in and have it checked out. I had mine almost a year, and it actually did fall out on it's own because I had a bactreial infection. Mine hurt (before it fell out) where it connected into the stomach and the doctor never called me back - a day later it came out. Anyway, it didn't take long (maybe a week) to close, although I still had to take the antibiotics. So yours should be looked at to make sure it's just taking a longer time to close. Good luck.
julieann