I used progesterone cream to help regulate my cycle and lengthen my luteal phase. I found that it only worked for me if I used it after ovulation and my lp went from 9 days till 13 days. It is hard to find a doctor who believes in using natural progesterone cream. I would hunt around and find a compounding chemist who makes the preparation. They will be able to tell you what doctor will prescribe it.
Failing that I have much more success after seeing a naturopath. She put me on a tailor made herbal supplement that worked on my cycle as a whole. It took 3 months for the herbs to take effect but I believe they worked better for me.
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