Didn't want to read and run but I have been looking this up myself, from what I have gathered LH surges so they suggest to take it at the same time every day and sometimes twice a day. I just posted a thread, if you look at mine you will see I started on CD 10 and there were lines back then, today is CD 15 and I think its finally positive but I'm unsure. I did have some that were fainter than others. Sorry I couldn't help more
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