Opk question

Hi all.

I have a question about opks. I’ve been testing twice a day the past couple days. I was supposed to have ovulated today but my tests are just now getting darker lines. Obviously, I have a few days to go.

That being said, the glow apps calendar moved my ovulation day out two days based on my tests. Has this happened to others? Maybe with irregular cycles?

I’m an ftm transgender and came off testosterone two months ago so we can have a baby. So being able to pinpoint ovulation is extremely helpful since I haven’t had a cycle in years. Thanks in advance for reading and any advice! 😄