Preparing for Best Pregnancy Outcome with Low Progesterone

History if helpful…if not skip to questions.
I’m 35, have two children. My first pregnancy I delivered at 38 weeks and the second at 36 weeks. My last pregnancy was over two years ago. Since then I’ve had changes in my cycle: slight changes in length (ranging from 24 days to 33 days… normally I have a 27 to 29 day cycle)spotting three or four days before my period, lighter and more drawn out periods (eight or nine days…normal for me is usually five). I’ve been charting using Creighton model for five years. I went to be tested at an NFP only clinic and they confirmed I had low progesterone and my LH and FSH ratios were inverted, so apparently I’m an the mild end of Polycystic Ovarian Syndrome. Early menopause runs in my family…my mom was completely through menopause by age 43 and my aunt by her late 30’s.

We would like another child. We wanted to wait, but my fertile mucus has declined over the past couple of years, and in light of history of early menopause and the signs in my body, I suspect I’m in perimenopause, so we think it’s best to try sooner than later.

QUESTION(S): How soon do I need to be on progesterone support if I conceive? I’m already on prometrium post peak +3 for ten days. Last month was the first month I was on the prometrium (300mg before bed). I’m currently on day seven and my husband and I would like to try to conceive this month. Should we wait? If we do become pregnant, how soon do I need progesterone injections? Is my post peak prometruim prescription enough to carry the pregnancy until I take my pregnancy test or miss a period?

Thank you for this wonderful site. So many of us don’t have NFP docs readily available. I needed to travel 2.5 hours to my appointment. Also, if I give my lab results to my family practice dr. would they know enough to help me with this? Would I have more success with a local OBGYN?

Christine