Leaking from Bellybutton After Abdominoplasty, Should I be Worried?

I'm sorry to hear that you're in this situation and do not have easy access to your plastic surgeon.
Your issue could be as simple as a fluid collection, or more complex such as a localized infection or a suture that is draining.
If you can't see or communicate with the surgeon that did your surgery you really need to see someone where you are as soon as possible to make sure that a small problem does not become a big one.
Please go see your plastic surgeon or a another board certified surgeon in your area as soon as possible.
I hope for you that this turned out to be nothing but it is safer to be evaluated.

If the leaking persists or if you develop an infection, you should see a local plastic surgeon in case you need antibiotics or drainage.

All surgical procedures carry certain risks and the possibility of certain complications.  In the ideal situation they would not occur, but unfortunately they do.  In the usual situation, when you have surgery you are usually able to return to your plastic surgeon to have a similar issue attended to and treated.  When surgery at a distance from where you live is contemplated this is one aspect of the decision making process that seems to incompletely considered.  This is especially true I find when patients consider having surgery outside of the United States which is done usually to save money, the problem being you do not have access to your physician when you leave.  I would say that most plastic surgeons in your area or any area for that matter are not anxious to see a patient with a problem from another surgeon.  Nevertheless, you should try to see a local plastic surgeon to diagnose the problem and treat it.

The problem you described may be a seroma, a fluid collection under the skin that the drain usually treats. It may represent a localized infection or reaction to a buried stitch in the region of the umbilicus.  Judging by your description of the amount of fluid I suspect it represents a seroma or fluid collection which may recur.

Thank you for your question and good luck.