HELP! Running while pregnant - Sore boobs

Kelly • Baby #1 born on 7.13.16
So I've been a runner all my life and want to continue through my pregnancy (as much as I can). My boobs are SO SORE, and even when I wear 2 sports bras, it doesn't help the pain.
Any runner/exercise mamas have advice or any special bras they would recommend to ease the pain & hold them in tight? I have to go sooo slow because they hurt so much!! 😖
Thanks ladies! 💕