OPK ?

Kayla • I`m a mother to two girls. One biological one step. My hubby & I have been married 2 years and ttc our 1st together.
So this morning with my FMU I got the flashing smiley on the Clearblue Digital opk! I was just wondering once you ladies get this how many times a day you atart testing and if any time of the day is best? :)