Senseless question ,it does not cause any difference on test .Even one or two days doesn't differ any difference.
It doesn't matter on hiv test .
4 weeks is what doctors recommend and it’s a great estimate, it doesn’t mean you literally have to go 28 days after exposure. There is enough studies out there that shows that combo tests can be accurate even after 2-3 weeks of exposure. Try not to worry too much, just focus on something else in life for now.
You can do HIV RNA test, results are accurate if taken after 11 days of exposure