Vainy Boobs?

I am actively ttc, but I got my period 3 days ago, it is fairly light - medium. Nothing crazy, but I've been noticing for the last 3 weeks prior to my period that my boobs have been extremely tender, to the point where I feel it looks like I have had a boob job. But since yesterday I've noticed that my boobs have been very vainey (not sure if that's a word) LOL, but does anyone know what this could be?