When's the best time to take a HPT?

Mikea • 29 yr old mother of 6 👦🏾👧🏽👼🏽👼🏽👼🏽👶🏽. Breast cancer cure supporter 💞
AF is due Saturday or Monday (have two period trackers & two different dates for AF). My last day of ovulation was the 12th. When should I take a hpt? I took two test Monday (blue dye) they were both positive. I took a digital last night, negative so now I'm confused. I've have symptoms but to be sure I want a more accurate test.