thanks you so much doctor and keep up the good work..
now I am releaved
WElcome back to the forum.
Responding first to the title of your question: I am unaware of any data that ureaplasma triggers reactive arthritis. It is possible that urethritis of any cause can do it, but chlamydia is the only proven trigger.
RA rarely causes merely "pain in the knees and ankles" as the only symptom; there would also be visible swelling and tenderness, and usually other symptoms. Also, 2 weeks after a triggering infection probably is too soon; it's usually 4-6 weeks.
To your specific questions:
1) Yes, the DNA tests for chlamydia are fully sensitive any time more than 2-3 days after exposure.
2,3) There is no realistic chance you have RA this soon, and Ureaplasma isn't known to trigger it. I have never seen or heard of such a case.
4) Ureaplasma is a normal bacteria in the urinary tract. There's a 50% chance your test will be positive, but if so it has nothing to do with your recent sexual exposure. You should not be treated even if that test is positive.
If your leg pain continues, see a doctor. But I recommend you put reactive arthritis out of your mind. My guess is that your symptoms are just the physical manifestations of anxiety from worrying about a sexual decision you regret.
Regards-- HHH, MD