It should say in the packet when to start testing. It all depends on what length of cycle you have. As mine is all over the show i started rather early and tested every second day or so as I didnt want to miss it. I o'd on day 20 and my last cycle was 45 days if that helps.
Also I tested first thing in the morning as i drink a lot of water and thought that would give me the most accurate result.



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