Well it's hard to tell since lupus is the disease of a thousand faces, it mimicks all sorts of illnesses, but I would keep an eye out and if you start feeling other symptoms like, muscle weakness, achy joints, tired,fever,hair loss, weight gain or loss, then I would keep bugging doctors. You can have lupus for a long time before it tends to show up on tests and such. Could be fibromyalgia too. Keep bugging doctors thats the only way sometimes to ensure a dignosis. The symptoms you have don't sound like nothing so keep checking.
But it's hard for us here to tell you what it could be, I had really really bad fatigue, achy joints(arthritis), mouth sores, stumach pains, hair loss and low grade fevers. My ana didn't come back positive until almost three years of feeling like this and I had to change doc's since my first one didn't really take me very serious.
Hope you feel better soon and get some answers
take care
