I haven't a clue whether the chemical has affected anything, maybe, I am just going to keep charting and see what happens, my temp dipped this morning, remains to be seen whether it comes up again tomorrow, my CM changed drastically yesterday but F seems to think I ovulated the day before I got my + opks. If I did indeed ovulate on CD19 then AF should be due approximately 14days later, so thats the 17th of september! If I follow my sons 'testing date' (another story there haha) then I can test at 9dpo which if ovulation stays put then that will be thursday