Opk postive 6dpo??

Hey guys so I was talking letrozole got a postive opk after 5 days of taking it ( last day of letrozole) opk was postive 4 days after it went to negative. ( doctor saw a follicle burst said I possibly ovulated) and I was testing every day since like it said they went negative at 5 dpo it was beginning to surge and 6 dpo there is a postive. Took a frer and negative. Highish and closed. I’m confused we baby danced just in case lol.