How early have you gotten a bfp with blue dye?

I'm about 7dpo and planning to wait a while longer before testing but I had a false positive back in April with a first response (only 2 1/2 months after having my baby and I had negatives before this one so it wasn't left over from my previous pregnancy) so I'm taking a break from first response and I'm gonna do a clear blue test this time how early have you guys seen a positive on clear blue?