My memory is still pretty fresh on this and your experience seems to mirror mine.
I didn't know what was going on with me physically. I kept examining myself and asking, "is that the estrogen or am I just cold?". A couple of times I thought my nipples were more sensitive, but I was never sure if that was in my head or not.
It turned out, I had iddy biddy buds when I got put on a meanigful dose of Spiro and E. I'd been on low dose E for a month and Spiro for four months before that. AFTER upping, changes started to happen very fast. I'm about ten days away from being on that meaningful dose for two months and today, my sloppy around the house day, I had to put on a sports bra. That was tender too but at least I don't have to be so careful with my steps.
When I did notice things for sure, they did tend to take me by suprise: crying at a video game cut scene, seeing the profile of a boob in the mirror when I stood sideways to it. So, hang in there.
I'm sorry to go off topic here but, I just totally can't beleive I get to write on this subject now!
Wow.