Getting more emotional at 34 weeks?

Is anyone else getting more emotional at 34 weeks? I had a complete breakdown last night because one of our dogs wouldn't stop barking and my boyfriend wasn't home yet. I yelled at him to stop barking (prob the 4th time) and then I just completely broke down and started crying bc I felt like I was being so mean to him (the dog). I locked myself in my room and left all 4 dogs in the house alone until my boyfriend came home and found me sobbing on the bed. My emotions have been pretty stable my whole pregnancy but all of a sudden I'm crying at the smallest things...