I think it would be exhausting! You might feel pretty good in the second trimester, but as far as the first and third....I'm not so sure. After two pregnancies following nursing school, and knowing what school was like, I'm glad I wasn't pg during school. I actually took a dialysis course during my first pg, and even that wasn't easy. I wasn't that tired, but very emotional and I felt like I couldn't keep up with the class. There was so much to learn, and I couldn't think straight (this happens during pg). When I told my classmates and instructor it was due to the pg hormones, I swear they all looked at me like I was nuts! It's not the best time to process new information IMO.
Would I rather have a baby, or go to nursing school? Have a baby...hands down! Looking back I am glad I got my license before having kids, but I love being a mom more than I love nursing! Best of luck to you.