Let's talk about boobs.

Okay, so at first I told myself I was crazy. And then my boyfriend mentioned it, and I thought,  it must just be because I'm fertile this week. And then I spent two weeks worrying, telling myself there's no way I'm pregnant. Of course, then I spent what felt like a year thinking: "Oh god, am I?" But now that I've both tested, and started, I'm really starting to wonder; why are my boobs bigger? Not that I mind (I'm a 32A), but bigger is complemented with SORE! For a month, I've been so tender I don't want him to touch my breasts, and I usually love it. I'm 26 years old, so it's unlikely I'm going through a growth spurt (again, not that I'd complain). Anyone else experience something like this?