Teaching in third trimester

Teachers...are you working up until baby is born? I’m getting increasingly tired and impatient with my 5th graders. I just want to be home but I know I have to stick it out at least till a week before my due date. I also go up and down 2 flights of stairs at least 10x a day. I’m just exhausted and I feel like I’m not the best teacher right now. Am I the only one feeling this way?!