Please help it would be helpful is it possible I missed my fertile day?

I've been ttc for 12 months and my stupid ass period just came today I am depressed. I've never used opks so I'm guessing I ovulated 2 weeks ago based on the chart cause I know you ovulate 2 weeks before your period correct me if I'm wrong starting from February 6 I didn't have sex until February 12
I'll start using them because I am so irregular