Has anyone gotten a BFP after 15DPO?

well I took an OPK a week after my period, every day for 10 days, all were negative - anyway I continued to have every day/other day, I took an early pregnancy test about 2 weeks later and got a faint positive! Perhaps you did ovulate later than you think, CM isnt a great thing to go on, try using OPKs instead and baby dance every day or at least every second day.