I'm ana-positive; could i have lupus without any symptoms?

See a Rheumatologist: This really needs to be discussed with a rheumatologist who can take a complete history and do a physical exam. In addition he or she will need to do additional laboratory tests before making the diagnosis of lupus or ruling it out.

Yes: Many diseases other than lupus and many healthy people have positive anas. You can also have lupus without having any symptoms and you can have a positive ANA for years before getting systemic lupus erythematosus. Most likely, someone with no symptoms and a positive ANA does not have lupus.