So let me get this straight: your school limits how many APs you can take? This is the same case at my school, though only for Freshman and Sophomore year. Make sure that your guidance counselor mentions that there is this limit: oftentimes a school sends out a mini “brochure” to all colleges along with transcripts that includes a little summary of the school’s policies and weighting system, so check with your counselor if the school sends out this report and if it mentions the limit on APs. That being said, as @happyfriday said, what matters is if you can take advantage of what’s available to you. Even though taking 2 AP courses is pretty good, remember that you are going up against applicants who have National AP awards (8 or more scores by application time). Furthermore, by self-studying an extra 2 APs (which I assume won’t be awful since you are interested in business, I actually had fun learning these courses), you can show adcoms that you are able to go above and beyond what everyone around you is doing. Seriously, I usually am very against self-studying APs since I feel it is tough to actually learn all the content on your own from a review book, but your interests and circumstances tell me it’s a good idea.
As for chances, you got a pretty good one assuming you get 2250+. Of course, you have to walk the walk. Make sure you prep sufficiently, and keep practicing for SATs/ACTs. You will also need (I believe, please look it up) at least 2 SAT subject test scores, and for Wharton I think the Math Level 2 is required. Aim for a 750+ on these, and really try for an 800 on the math 2 for Wharton. Again, you have a good chance, but you gotta get those test scores in the bag. Those extra self-study APs should help, and I would strongly stress making sure your essay is good.
http://talk.collegeconfidential.com/what-my-chances/1752114-predict-me-game.html#latest