I've had what i think is a "period" for 10 days. not heavy & hardly filling up a reg tampon . should i go to doctor ?

Depends: Is this at the time when your normal period should be? If yes, it may just be a little different than your usual cycle, but I'd just keep an eye on it and see if your cycle resets itself. If this is at a random time, and irregular cycles aren't normal for you, seeing a doctor for evaluation is a good idea. I would also check a pregnancy test.