Well ladies, for those of you that know me know that I'm the queen of OPK's! I love Wondfo brand and have been using them for 3 years and they haven't failed me. Well last month I bought some First Response OPK's in a bind and they worked for me and my + OPK's coincided with my thermal shift. I saw them get progressively darker so life was good!
This month, I decided to test the Wondfo's against the FRER's. Here's my grrr... Wondfo's have been progressively darker and tonight's was +

The FRER's however, were dark 2 days ago, lighter yesterday and even lighter today... nowhere close to being +! I have the most EWCM going on today which normally I have about 4 days pre O but I've been drinking a lot of water. I guess we'll see what my thermal shift says but how odd that the 2 tests are reading SO different