Mine hurt so bad last night i wanted to cry. I already have to sleep with a pillow under me. I'm 8 weeks tomorrow.
Sports bras definitely, supportive but not too tight (which means you may already have to go up a size from your normal). Nothing will really help the soreness but the support helps keep them contained at least. It'll pass, it got better for me in the second trimester.
I found wearing sports bra to help. The provided just enough support adn comfort, but without being too tight adn restrictive like a regular bra.