August 9, 2016 at 11:44 amI'm 4-6 days late. From my experience with bbt I feel like I ovulated on cd 14. FF is telling me cd 16. My average cycle length is 28 days and 12 LP. Took a test on Sunday BFN. Not really showing any symptoms really but tired more than usual and really wet cm. My last period was 7/8/16 and it was 3 days early.