Has anyone tried it?

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Before you say anything... I know that opks are not a good indicator for pregnancy. I just want to know if anyone actually tried it and worked because i’ve seen couple of videos on youtube, some worked and some not.

If you tried it and worked pls share your experience and share a photo if that okay. Im supposed to get my period 21st or 22nd or today 23rd. Normally i get cramps and pain and thats how i know my period is coming but im not having any. I took a pregnancy test the last 3 days and all came out negative and i dont have any left.