You need to make an appointment for renewal ASAP if you haven't already done this per all of the replies urging you to do it. The question isn't if MX will let you in. If the U.S. allows you on the plane then you will be let in. Your immigration documents are what need to be current for entry into MX once you deplane. We do not work for the U.S. customs/immigration department. You are best served contacting them directly regarding your question "am I at risk". You have may have read my opinion - if your passport has not expired when you board in the U.S., no problem. The risk I see now, at this late date, is if you apply now for renewal you must give them your passport, if renewal isn't expedited before you plan to leave on the 4th, you won't be going to the U.S. until you receive the renewed passport.
You started this thread last Friday morning. Why haven't you done something by now to receive answers and/or already requested an expedited renewal? Not very prudent IMHO.