Pre-qualified is the first step in the buying process. It is based on the data that you submit to the lender. It is not a sure thing because it is just based on the information that you have provided. This just helps give you a snapshot of your financial picture that includes your assets, liabilities and equity. This is a good indication of creditworthiness and the ability to borrow.
Do you have a mortgage broker yet? If not, I can connect you with my trusted mortgage brokers.