Irregular cycles and Low progesterone

A few months ago I was put on progesterone pills to help induce my period, this way I have them at the very least every 3 months. But my doctor never explained what happens when you have low progesterone.

So one day I googled low progesterone signs. I have a lot of the signs and symptoms (and maybe if my parents recognized them it could have been found earlier). Then I found something that said low progesterone leads to infertility because the womb is too thin and cannot support the weight of a baby. Which means even if I do become pregnant, I may just have a miscarriage.

Does anyone else here have low progesterone? Does low progesterone mean I'm infertile?

Thanks for any help that you guys can give.