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opk question

Huesman • Wed, Nov 01 • Mom to 2 boys (13,10) ,👼👼👼👼 and a princess (4/6/20)🎀

I'm very new at using opks. I understand that second line is darker than test line for a positive. I received the tests after my O day and have periodically used them this week. I'm 8-10 dpo and my second line started getting darker. not positive though. is there an lh surge prior to AF?

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