Can anyone help explain my chart and my DPO?

Nicole

I have on FF my info. I swear I O’ed on Cd 24 MAYBE cd 25. The temp dipped at first +OPK and symptoms and rose day after that. I don’t understand why FF has me Oing on CD 27? My fertility specialist told me (not scientifically proven) to BD the day after first positive OPK and EWCM for best chance of a boy, so I did. Now I’m worried I messed up and missed my day!