Hi there. RA can affect the young, in fact it is called "juevinille arthritis" (my spelling may be bad due to fingers hurting). I am 24 and I have been diagnosed with RA. From what I have been reading most people are diagnosed with RA from 25-40. I think people just hear arthritis and think of the arthritis that elderly people get. Too many commericals on tv I guess. My friend had some of the same symptoms as me and she is only 27 but she found out she has Lupus.
My advice would be to see an actual Rheumatologist. Most of them will take a while to get in. So what I did was make an apt with several doctors and had them put me on cancelation lists. That way I could get a second opinion and so on. They have tests that will determine if it is RA vs Lupus. My general doctor did those for me and then my Rheumy doc had more RA tests done for me once he saw my Rheumatioid factor.
And I don't know for sure but I would say that an oral contraceptive would have not much to do with any results like that. I would say....get a different doctor to do more bloodwork on you--if you can a Rheumy. No offense but that one sounds....well, I would just get a different opinion.