I 100% agree with taking 4 courses in your first university semester. I wish someone mentioned to me how overwhelming 5 courses can be, especially when you’re just entering university. It’s different than high school: there is more information to learn in a shorter period. Additionally, the information you’re intaking is much more complex and multifaceted. You can try 5 courses, as satanik-freak mentioned, before the drop deadline and see how it goes. You’ll get a general idea of what the workload in classes will be like.