need edvice!!!!

i am under so much stress I'm dealing with this pregnancy ...my boyfriend who is the father of my 1 year old and my unborn child..his mother and I got into huge argument and she put her hands on me and I'm 29 weeks & 2Days preganat.. I so livid I dont want her around me anymore & and dont won't her at the hospital when the baby is born..I'm not over reacting am I? its understandable that I feel that way right?