What exactly happens when a mortgage lender checks my credit? : HTTPS://WWW.CONSUMERFINANCE.GOV/ASK-CFPB/WHAT-EXACTLY-HAPPENS-WHEN-A-MORTGAGE-LENDER-CHECKS-MY-CREDIT-EN-2005/
According to the link above from the Consumer Financial Protection Bureau (CFPB)
A mortgage inquiry has a small, but negative impact on your credit score.
You can shop around and have multiple inquiries for 45 days, and the impact is the same as one inquiry
You can get a free credit report at www.annualcreditreport.com