Positive opk 6dpo.... anyone?

Today is Cd 22 & I ovulated on cd 16. On cd 19 I got a negative opk. On cd 21 I got a extremely + opk the test line was way darker than the control line & it wasnt with FMU So I took another opk today & the test line was extremely + also it wasnt with FMU.. BUT I've had negative HPT.. has anyone experienced this and gotten a BFP?