What to expect with Progesterone?

I am just shy of 4 months on HRT. My doctor said she wanted to wait until at least 3 (was a bit late to my bloodwork 🤭), so yesterday i asked about it and well got a script for 100mg tabs (surprised there was no prior authorization unlike the Estrogen)

I haven't done a lot of research on progesterone (seemingly, no one knows shit). However, from those with experience, what should I be looking for/looking forward to both good and bad.

I have had a bit of growth and budding from the estrogen alone (no blocker), so I'm hoping that means I'll be receptive to the positive effects as I'm not planning on top surgery.