Breast soreness!

Danyel
Anyone out there have this before labor?? My first son was preemie at 31 weeks so I literally had No signs of labor except the contractions that sent me to the hospital. I'm 37+5 and woke up today with a sore belly, painful tailbone and now my breasts are feeling really sore and heavy, plus a Big increase in mucus discharge! I've been having contractions since Sunday but nothing consistent. Just curious!? Thanks in advance!