I have no idea what my boobs do as part of my cycle because I've been pregnant and/or breastfeeding for 3 years . We are now trying for another baby and I gave up breastfeeding a week ago. There was no soreness or anything and I was expecting my boobs to deflate pretty quickly. They have literally just started to feel a bit firmer since yesterday and there's a bit of soreness there (more today than yesterday).
I'm on Day 17 and possibly ovulated around Day 12ish.