Last mintue Buyers/Broker's Contract

[Tong Vang]

Hi all.  I am a buyer and have a house under contract already.  I have been given the clear to close from my lender.  Our close date is next week.  Anyways, a few days ago my real estate agent emails a buyer/ broker contract and wants me to sign.  I am not sure if I should or not.  It states buyer will pay broker 2.7% of sale price and $425 for admin fees.  Do I need to hire a lawyer?  Please, I hope some one can help with some advices.  Thanks