This will entirely depend on the difficulty of the classes and the type of student you are,
but as a reference most schools operate with an average ~15 credits (4-5 classes) per term to graduate with your degree. Your school might have a "program of study" or something similar where they outline all the classes the major has to take and a recommended guideline of what year/term each class should be taken. You can use this to compare how many credits/term other students in your major are likely taking.
An
example of a "program of study" taken from the biochemistry major at Colorado State University. Most terms are 14-17 credits.
If you did pretty well in high school (as I'm assuming you did because of AP credit) you should have no problem handling 14-17 credits/term.