One of my issues was an ovulation/luteal phase issue - both intertwined. My ovulation was late and my luteal phase was short (9 days). I was told that for best conditions for implantation luteal phase needs to be 12 days, possibly 10 as a minimum (I have however seen ladies on BB get UTD on 9 days though). I had been charting and googling before I saw my FS for the first time and as soon as she saw my ovulation and luteal phase issues she popped me onto clomid to bring ovulation sooner and progesterone pessaries to lengthen my luteal phase. My luteal phase on progesterone was as long as the time I took the medication as AF didn't come until I stopped the meds. I had to have a BT each month to confirm I wasn't UTD before stopping the meds. When I got pregnant on IVF I had to take crinone (progesterone substitute) for the entire 1st tri as it was assumed my progesterone could be a problem. So, the diagnosis for me was basically taken from my charting. Apparently there can be a link between the follicular and luteal phase so my FS decided to treat both.

I also saw a naturopath and took vitex the cycle before I saw my FS and got my first 12 day luteal phase from that but I came off when I started on progesterone.