PT not delay

Hi momsh! To answer the question, pwede ba mag PT kahit hindi pa delay? Pwede naman, pero based on my experience, medyo maaga talaga kung hindi ka pa delayed. I tried it once kasi excited ako, pero negative ang result. A week later, nung na-delay na ako, positive na siya. So, sa tingin ko, mas accurate talaga kapag hintayin mo yung missed period mo.