Progesterone Questions

TW: Pregnancy loss.

TTC again after 3 losses. I am just wondering when most people start taking progesterone suppositories (2-3 DPO or after positive pregnancy test or some other time) and how much you take. Different doctors have suggested different things to me and I’m not sure which advice to follow.

I definitely think I might fall into the super fertile category and I know people have mentioned that progesterone supplementation can help prevent non viable embryos from sticking but my last loss was the only one where I supplemented with progesterone and it was a partial molar (69 chromosomes).

Any advice is much appreciated.