I would guess you are 'probably' fine. Have you received your packet by snail mail yet? On my prior on-line personal account I received copies of the receipts in the regular mail about a week after it opened. Does it have the "Your Banker" phone number on your 15,000 mile receipt? You could call and ask if you are concerned.

Unless you are trying to slide by with something that technically disqualifies you (like I am on my current new account ) I would not worry to much. I think most problems with miles not posting are from people double dipping. My last two accounts initially failed to post properly (I'm sure because they were opened in somewhat fast succession with the two accounts before them) but none the less when I called the 1-877-292-4273 it was very easily rectified and I got my miles.