Make copies of everything you send into WP admissions.
Push Hard, Press Forward
If you only got a call from your senator then I suggest you wait a couple more days for an official letter. In a lot of cases the MOC will call to tell you the good news and then a letter will come in the mail from their office confirming it a few days after the call. If you don't want to wait for the letter or if it doesn't come, then call the senator's office and ask them to email or snail-mail you a copy of it. Then send that into WP if they don't have your portal updated by then.
Jspar16, take the advice of 845something and relax. All nominations had to be in to West Point by January 31st. I'm certain it is already in their hands. Admissions is slammed right now! Your portal should be updated within a couple of weeks. Since your nomination is a "principal" and you have been fully qualified by West Point, you will probably be seeing that BFE in the next wave of appointments. Congratulations and good luck slaying THE BEAST!