OPK Help!

So, I’m currently around CD15. I’ve been taking OPK’s since around CD4. According to Glow, I’m supposed to ovulate tomorrow, but I’m still getting negative tests. I took the bottom test around noon today and it’s by far the darkest of all the tests I’ve taken, but it’s still negative. If I am supposed to ovulate tomorrow shouldn’t my LH surge be today? And shouldn’t my tests be positive at this point?