I have a save where I rotate between all my favorite premade households in the game. I sent 2 students to start university and moved them into a dorm together. I switched to play another household that was expecting (I wanted to be able to play through the birth and name the baby) but when I came back to my uni sims, one had not yet started her first term while the other had completed her first term with a D+ and was on academic probation! I don't understand how this happened and I really wanted both sims to graduate with high honors :(