need some help!! how many pos. opks clise to af actually were bfp?

Star • Getting married march 2014 have 2 beautiful baby`s ttc 3rd. Ttc 17 months
and if they weren39t. if you got a bfp after a pos. opk how many days after. I took one on accident from the dollar store and it said pos. surge. lines same darkness. I39m 11 dpo. I really don39t think I39m pregnant have pcos starting my first cycle of clomid as soon as AF shows.