I wouldnt worry too much if I was you.
Do you display any of the symptoms of RA or Lupus?
Im not a big fan of believing my blood results, I can be in a major CD flare and my bloods say Im normal - huh? I got acute pancreatitis that my bloods didnt pick up till I went to ER - but thats just my opinion in regards to my body.
If you are concerned see a Rheumy and have the appropriate scans/xrays done.
Here's hoping your blood tests are wrong
Crohn's Disease, Ankylosing Spondylitis
Bowel Resection Sept. 07