How old is your animal? That you are refering to it as he/she makes me think it is still quite young (i.e too young to sex) and because of that I would not advocate every 2 weeks if that is the case. More like every week. I only recently took my 5 y.o. female to every 14 days. Before that she was on a 7 day cycle.

What time of day are you feeding? Are you warming the F/T. How are you heating? Are you heating at night? Have you tried tail tapping?