Negative turns in positive after 1 hour

Andre

So, i took a test because i was very stressed.

I waited 3 minutes and it was negative.

I still looked at it for a bit so it was negative but after an hour it turned "positive".. it s valid?

I want to specify that i didn't have sex yet and the only thing i did was mutual oral sex with my bf

But i was really stressed if the sperm could be transferred mouth to mouth and then to vagina so i took this test