This is one of those "depends" questions lol. Every female has a different experience when it comes to pregnancy. When my wife was preggers, the midwife told us the first trimester would be the worst in terms of acid reflux and low energy levels. Unfortunately, this lasted until the day of labor🙁 During this time, my wife was able to take courses full time albeit, being miserable. Granted, the courses were also online. I have heard other experiences where there are minimal complications through the entire gestational period, making school doable. It's very unpredictable as to how the body will react, but with enough determination I think it's possible.