When to shop for convential rates

[Brandon Payne]

I am making offers for my first property. When I got pre-approved for a conventional loan, I didn't shop around for different rates during the grace period where multiple credit-checks wouldn't effect my credit score differently than a single hard credit check.

When the time comes that an offer is accepted and I go to get a mortgage, can I shop around for rates without a negative effect on my score -- i.e. do I have that same grace period where multiple credit checks from mortgage lenders will lower my credit the same as one credit check?