My OPK's are in the mail on their way!!! I'm going to nail down my O-date if it kills me!!! So my question: Why can't I use FMU? You're supposed to POAS around the same time everyday but also supposed to not have gone to the washroom for 4 hours. I have a wicked-small bladder and can't hold it for 4 hours and the only consistent time that would work for me (due to my wonky work schedules) is first thing in the morning... Or should I do them twice a day (I've seen some people do this... not sure if it works?) FX for me this month!