Dukhe, If your I20 is valid and you've a Valid Visa, also if you haven't worked off campus, you should not have any problem no matter where your POE is. But if you have worked using ssn outside campus, you might get in trouble. But that's very rare. Most students do not have any problem at POE. You should be fine. Don't worry. I am telling you this from my personal experience. I've travelled via chicago as POE and i never had any issues. Good Luck . Enjoy your trip to Nepal.