haha thanks for that. I thought it was estro but I'm not too sure. All I know is they feel they are about to fall off and this is the worst I've had them. I want to take something to stop the hurt but.. well Ya know the drill TWW need to be very careful haha :)
I think it's actually both. There seems to be a lot of confliction about it, with some saying it's the elevated Estrogen, and others saying it's the progesterone that causes it. I think I once read something though that says they use progesterone to help treat breast pain as well too though. Lol, sorry this probably wasn't much help at all. I would just say it's both.