Opks help

Ashleigh • Engaged to my best friend and soldier. We have a 5 year old son, and currently ttc our second ❤️
On what cd did you start testing for ovulation? I'm on my first cycle of clomid and before this I never knew if I ovulated so this is all new for me. I'm on cd 15, and was told by my obgyn that I would ovulate on cd 14. Friday I had a faint line, yesterday it was a tad bit darker then Friday but not positive, and today it looks like it's completely gone. Did I miss the surge or is it possible i haven't O'ed yet