Blood test?

Kaiti • 26; Married; #1 coming June 2020💕 🐵🍼🎀👶💍

At what point after missing your period should you go and have a blood test done? I’m currently 3 days late and got a positive home test yesterday. However, due to my kidney/bladder issues sometimes the proteins have been know to give false positives. I don’t know if I should wait a few more days or just bite the bullet and go in?