Please if someone can explain this to me, I’m getting positive ovulation tests since CD 14.

I am on letrozole from CD 3-8.

•my doctor said these tests are still valid even though they are days old because the test looks the same from when it developed

•the tests are valid from Cd9-15 even though they where removed from the plastic casing

•I have not been able to speak to my doctor about this because they have been closed the past week from the winter storm we had here in Texas, they re-open tomorrow.

TIA ❤️🥺