Testing right after my period!

Tierany

So I only have a 21-22 day cycle so I’m started to test on the last day of my period. This is my first time taking ovulation tests so do my tests look right on track? The last one today I used FMU and I read that I shouldn’t so I’m trying to hold my pee so I can take another one.

I’m confused because they were getting darker and now they got lighter again. Is this normal?