Ovulation help!

Maddie • TTC FOR #1 going on 7 years. step mama

CD 16 ! top two. very faint positive. the CD 17 one test. darker then all but still not peak. CD 18 today I've taken 3 through out the day and they all are lighter then the one the day before. what is going on. Did I miss peak or is it still to come.? Help please!