I started using Prometrium (micronized progesterone) in October. I've noticed a few things...
There are "tingly" feelings in my breasts, just behind my nipples.. Not like the pain you feel during early HRT.... These sensation are really nice.
Definite changes in my nipples... they're darker and have grown just a little from beneath... they look a bit perkier than before. It's hard to put my finger on how but my breasts, overall, just look better.
My sex drive has increased but in a very feminine way; I feel like I want to be really, really close to someone and have that person inside... I've been fantasizing more frequently. It really sucks because I'm not seeing anyone right now.
I've become kinda bitchy. I've lost a bit of my usual ability to deal with disagreements without getting angry. My best friend, a g-girl, told me that it's like PMS.
Overall, I love the physical effects but the emotional effects are a mixed bag.