THINK I MISSED MY WINDOW

This is the first month my Husband and I have tried using the Clear Blue ovulation tests and the Preseed Lube. According to this app, my ovulation cycle starts today but when I tested this morning as well as this evening my results are barely visible.(you Really have to strain to see the line.)

What has me confused is that a few days ago my lines were darker than they are now. So could anyone explain the “rules” of ovulation tests..am I doing something wrong?

I hope I didn’t miss my window but I feel like I may have. It’s hard to tell since I don’t have any previous experience with these tests.

Also I am taking Prenatal vitamins would that possibly throw my test results off?

We really want a baby 🍼👶🏻

Thanks everyone for your help