Since I switched birth control pills, my periods are very light and only last 2 days (compared to 3-4). Is this normal?

Yes, it is normal for changes in menstrual flow to occur after switching birth control pills. It is possible for the flow to be lighter and last for a shorter amount of time. These changes are usually temporary, and your period may return to its previous pattern over time. There is typically no cause for concern if this occurs.