My luteal phase is 8/9 days currently, its incresed from 5/6 but im on my 14th month of ttc! Some GP's listen and act, some, like mine disregard it and tell you its fine and to relax. In my opinion it s a problem or other women in different counties would not have treatment for it. 10 days though isn't too bad i don't think, ive read that a minimum of 10 is whats needed so your right on the edge.