Need help/opinions

So I tested with opk this month and I got my peak LH surge on 5th Feb. I know it can take up to 36 hours after to actually ovulate so I guessed I probably ovulated on 6th. Now I am 16 Dpo, 2 days late for af and still bfn I don’t know what to think/do?

Any help or opinions on the situation would be greatly appreciated