I've felt some occasional bounces as well, even though I'm just reaching three months into hormones right now. Usually associated with taking a downward step on stairs or a running step. Also have started to feel some strain on my chest while walking, which is my preferred form of exercise, so I don't know if I should look into getting a bra. According to a measurement, I've reached a full A cup even though they don't look like much since I have a pretty wide chest.