How many dpo am I? Start of a line?

ttc33

I had + OPK on cd13&14. I feel like I O’d on cd14 or 15. Ava predicts that I didn’t until cd17. Thoughts? I took a test this morning bc I’m feeling a little off. There’s a super faint line but I’m assuming it’s probably just the indent as frer is known for that now:( plus it’s super early if it so. Thanks for looking!