Is it possible for OPKs to not be good if they’re exposed to cold temperatures? I was keeping the box of them between my bed and the wall and on the other side of the wall is outside. This is also below a window. Are they broken? I haven’t had a surge and all cycle and I’m pretty deep into it. I think I ovulated last Sunday because I was having some cramping that whole weekend. Also whenever I test the tests always comes out at about the same level. Any thoughts?