Do not just get a credit report from one of the credit bureaus. You need to look at your credit report from all three credit bureaus. While the topic of the credit report is the same, your credit history, the types of information recorded by each credit bureau can differ.
Also, mortgage lenders do not subscribe to the same credit bureau. So while your information may look fine on one credit report, another credit bureau may have data that does not make you look like a good risk for a loan.