LH Levels// OPK

So I am on my first month of logging my opk. I started texting the very first day of my cycle, when my period hit. Every day I would test, my levels would be pretty dark, but not darker than the control line. Now I am coming up on ovulation in 5 days and my line on my opk test was lighter today. Also to note, my period was 10 days late, so I’m not sure if this could affect anything