So confused, please help

I’ve had 4 days of positive ovulation tests so far. How do I know when I’ve ovulated? Any help would be appreciated!! Here were my results (all tests taken at same time of day):

- Thursday - lines were about the same color, the test line was slightly darker than control

- Friday - test line was MUCH darker than control line

- Saturday - lines were the same color

- Sunday - lines were the same color

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