Remember that when you hit Submit, it amounts to your sworn word that all the information contained in the AMCAS application is correct before it is forwarded to the schools that will receive your AAMC medical school application. If the AMCAS application notices a discrepancy, they can put you under Investigation.
That is a long process that delays your final submission and may cause you to miss deadlines. Avoid this happening by verifying everything is accurate and matches your records.