Rates are moving around so much, that lenders are allowing rate protection (certain ones, that is). It depends on who you have your loan placed with. If you used a broker, contact him/her and let him/her know your concern. He/she will let you know.
If you are going direct to the lender, ask them. They will tell you.
Also - the rate lock only happens after the loan has been submitted for underwriting to the lender. If you haven't submitted yet, you aren' t locked in yet. Just food for thought.
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