Your credit score is the biggest factor on getting a mortgage loan. The higher the score can save you thousands over the life of a loan and allow you to get a loan with a lower down payment. Please read about improving your score and if you are not in the 700's see if there is a quick way to get your score that high. If you are under a 600 getting a home or refinancing is still a possibility just work on your credit and maybe in a few months you can get your score up. Some things can be quick and easy.

http://www.myfico.com/crediteducation/improveyourscore.aspx