OPK Question

Anyone ever used the "Answer" brand of opk? Just wondering. That's what I have been using this month and having a hard time getting a positive. Idk if it's the test or what. I read reviews online that it isn't like the box says. That the test line has to be as dark or darker than the refrence line. So I'm just wondering if anyone had used these and what their insights are. I have attached a picture of the ones I have taken. The one that says "12-2" is what I thought may have been my positive but didn't know for sure!