Anyone had a positive at 3 weeks 1 day? Faint or clear?

So I’m 3 weeks 1 day and I took a test and got a very faint line that you can only see in person I can’t even get a picture on my phone idk whether to trust it or not but I looked it up and it says it’s not possible to get a positive at that point but has anyone gotten one before that early? I got the 3w1d from a calculator on an app for due dates