Tested using CBA and opk Wednesday morning, got a High reading and negative. Tested again at 8:30pm and went to Peak and positive. Next morning at 10:30 am after 4 hour hold got an even stronger positive opk - prob strongest I've ever had in months of testing. Now FF telling me I ovulated the day I got my first positive and peak at night. Since I test twice a day, I know I didn't miss the beginning of surge. Temp Thursday was only a slight jump, but usually FF is accurate for me.