body cleaning it's self out?

For about the past week I've been having bowel movements which is weird because I have been SOOOO constipated through out this pregnancy. Don't get me wrong I am not complaining one bit! It's nice to FINALLY be able to poo. I've also been feeling a little nauseas lately and haven't had a real appetite. My mom is telling me this is my body's way of getting ready for labor. Has anyone else experienced this? I'm 33+