Positive ovulation

Chloe • Our 4th baby is due Nov 18 ❤️ 👦🏽👧🏼👶🏼
I have had four days in a row of positive ovulation test, they are exactly the same colours on all of them. Fertile week is meant to end today.
What reason are there for them to still be positive? I am really confused. AF due the 13 Aug.