RA or something else??

Hi, my rheumatologist diagnosed me with PMR over a year ago and now has switched that diagnosis to RA. I was on prednisone for over a year for the PMR, which was a very low dose of only 2 mg and completely took the pain away. Then the pain started to creep up after a year and so did my inflammation numbers so my rheumatologist then did further bloodwork and my anti-CCP came back very low positive, which is why I was then diagnosed with RA. He switched my medication and took me off prednisone and put me on hydroxychloroquine. I actually have minimal pain and I never really had much pain except in the very beginning, and it was quite minimal, but once I started the meds, everything went away. also, RA factor is negative. Has anyone ever experienced this with a very low positive? Anti-CCP and negative RA factor and it not be rheumatoid arthritis? I’m really doubting the diagnosis. I’m thinking I either have a very mild case of RA because of the absence of pain or stiffness or maybe I have something else? Or maybe I’m just in denial, but I am quite confused. Any feedback is welcome