ovulation test did I make a mistake?

EmJay
So I've been taking ovulation tests since a couple days ago. The lines on the test were there but not dark enough to indicate a "positive".. but the lines WERE getting slightly darker as each day went so I knew I was close. This morning I tested again thinking for sure I'll get a positive but the line was almost non existent 😒 I checked my CM and there was none either. Wtf! The only thing I can think of is this morning I didn't rest with FMU so I don't know if that would've had an effect on my test result? What do you think? I'm going to keep testing but I'm so disappointed at that line being so faint when it was a lot more noticeable the day before :(
Also I should note that it's been 10 days since my period ended, is it too early?