When did you take progesterone & estrogen ?

Jessy • 3 years of ttc, 2 angel babies. Welcomed our 🌈 11/12/15💙, second bundle 11/20/17 💙, baby #3 💙, baby #4💚
I'm curious ladies! When did your RE tell you to take these hormones? It's okay if you've only taken progesterone. Last time I took the hormones was while I was pregnant with my heterotropic pregnancy. So I wonder when to take on ttc cycle. Thank you for the input !