my day 21 progesterone was 56 nmol//L - what does this mean?
My last 2 cycles following my 3rd mc were 27 days, perhaps this needed to be done on day 20? My cycles have got a day or 2 shorter
Yep, as Cleg has mentioned, a progesterone level of 56 nmol/l is good and shows you ovulated. Most clinics will look for a level of 30 nmol/l to indicate ovulation. Progesterone peaks at 7dpo so this is ideally when it should be tested. A luteal phase (from ovulation to AF) can be anywhere between 10 - 17/18 days and it's a complete myth it's always 14 days......
....obviously I'm not medically qualified but your result looks absolutely fine to me