I don't have lupus but I too have a positive ANA test. They ran the test again because they were surprised that it was positive and it came up positive again. I had thyroid cancer as a teen and am now hypothyroid as it had to be removed (and I am taking synthryoid daily) I also have ulcerative colitis. My family doctor was concerned at first but my GI doctor says that more than likely it is a combination of the thyroid and UC that's causing the positive ANA result.
I haven't had any signs of RA or lupus so I guess they're right that it's other autoimmune issues that are causing the positive.
I hope it turns out to just be a random positive ANA result for you too.