There is no timer inside a human's blood system that goes off at 84 days. If you used 83 you were 98.8% of the way depending on which hour of the day you did it. Test again if you feel worried otherwise move on.
We rely on the opinion of expert doctors so do not pay attention to whatever you located saying 90 days otherwise we will be here arguing all day about what goes on in someone else's mind.
"I had negative oraquick oral swab tests at 4, 5, 6, 8 and 9 (66 days) and all were negative."
If testing at "4-5-6-8-9" weeks don't bring you the peace of mind, you need to perhaps see your counselor to fix your anxiety issues. I am confident that you already know you have tested negative, definitively.
The reason you are here at the first place was due to anxiety, it was your assumption that your partner is HIV positive, it's highly probable she isn't.
You can keep asking questions here all day long but it's not going to lead you any where, fix what the real issue is, keep working with your counselor to overcome it.
You don't need to test any further and certainly don't have a concern that belong to HIV prevention forum.
Goodluck.
Is it likely for a 9 week oraquick swab to change?
You only need to test once at the appropriate time. Oraquick requires 84 days. No one here pays attention to symptoms and you shouldn't either because docs can only diagnose from a test. Or you can do a duo any time since it is after 4 weeks to get a conclusive result.