OP,
I've done this more than once, and you will just get a negative blance until the charges post.
FICO Scores (MARCH 2016): EQ 829; EX 825; TU 828
AmEx BCP $25,000; AmEx Platinum (NPSL); Barclaycard JetBlue Rewards $5,000; Bank of America Cash Rewards $27,500; Chase Sapphire Preferred $33,700; Chase Marriott Rewards Premier $15,000; Chase Freedom $12,000; Citi Prestige $30,500; Virgin America Premium $25,000; The Home Depot Card $20,500; Capital One Platinum $15,000
