3 months is conclusive and there is no need to test more than necessary.
If your exposure was Jan 10, there has been 77 days or 11 weeks, so if you test know regarding Drs. Post your test is up to 98%-99%, but for being 99,99% you need to wait another 13 days to have a 3 month conclusive test.
This is a repost from the Drs, forum
but here's one more fact that might be helpful- at eight weeks over 98% of tests that are going to be positive will be, thus unless you are at extraordinarily high risk.
I hope it helps you. and it would be great to know how risky your exposure was.
3 months is conclusive and there is no need to test at 6 months