Sometimes it's too late to stop an early miscarriage, by the way, esp. if the baby has already died in the womb. But if I'd known there was even a small possibility, I would have asked for a sonogram to see if there was a heartbeat, and then progesterone-and-a-prayer.
It’s possible to administer progesterone before there are any signs of possible pregnancy loss, especially if the mother has a history of miscarriage or has other symptoms of low progesterone.
But what doctor would recognize the symptoms of low progesterone, even if you showed up with your nfp charts?