Progesterone cream to lengthen luteal phase

Has anyone used progesterone cream to lengthen their luteal phase? Mine seem to range from 10 to 12 which is on the shorter side and maybe think that is why i haven't conceived yet. For those that have used it or currently using any what it is and if you have had any success. Also any product that doesn't mess up their cycle seeing as my cycle now is roughly 28 to 31 days.