Whatever you decide to do, you should do it within a short period of time. I think the going timeframe is two weeks, whereas the powers to be at fico would not consider that as a negative factor(working against you). But it would be viewed as you doing some comparative shopping. Shopping for a mortgage should be done in a short time period so it doesnt harm your credit that much.
But I would call and ask to speak to several lender reps of different mortgage companies to see where you stand as far as credit. Just to get an idea of what they are looking for as far as scores. But dont, and I repeat dont give them your social to run your credit. Then when you find some that are of interest to you and you are really ready for them to prequalify you call them back. Only give out your social when you are absolutely ready to purchase.
Sweetdeedee