They are inaccurate!
I have been using them for the past 3 months and have had really inconsistent results. This it the first month that I bought wonfo's from Amazon and this afternoon I used both the wondfo and the Walgreen's Daily OPK (off brand for Answer) and I had very different results. The wonfo had a very clear positive response whereas the Walgreen's brand had a faint line. I was highly confused and did a little research on the Walgreen's brand. So many users gave them a negative review and had some of the same challenges that I have had. Using a faulty OPKS for the past few months makes me a little irritated but at least it makes me hopeful for this month that our timing may be a little better.
Happy Sunday!
Re: Warning: Do not buy Walgreen's Daily OPKs