4th gen test + symptoms = false negative?

[3shadesofblue]

Hi, i posted some days ago, i took a 4th gen test at 9+ weeks after posible risky exposure. The test was negative.
BUT since yesterday i've had a sore body, like when you  push your body too hard exercising or lifting things, but i have done none of this and have no other symptoms. i read one of the characteristics about ars is muscle pain.
is it possible to be seroconverting despite a false negative?
also, what are the chances that probably they might've mixed up the blood samples at the lab? have you heard of ths ever happening?

[nursegirl6572]

is it possible to be seroconverting despite a false negative?
also, what are the chances that probably they might've mixed up the blood samples at the lab?

This is 100% anxiety talking.

Your result was conclusive, you don't need anymore testing.  28 days for a DUO test is definitive.

[3shadesofblue]

(the reason i put 9+ is because i've heard the best time to take a 4th gen is between 4 and 6 weeks, and that after week 8 they probably work as good as a 3rd gen, which has a winow period of 12 weeks)
could someone also eplain what is the difference? i don't really get how the antigen/antibody ratio part works.