Disclaimer: Please check with your Real Estate Agent and Local and State Lawâ€™s Guideline regarding submitting and withdrawing your offer! This may not apply in your state!
Before you go putting in offers all over town, though, you want to be sure that the contract you have signed has been withdrawn if the seller hasn't signed it. If you are in attorney review, you can also get out of the deal, but your attorney will handle that for you. Be sure to get copies of all "kill" letters your attorney writes. You don't want to wind up having to close on more than one property.
the offer is valid until either the seller accepts your terms as written or the parties amend the contract to satisfy both sides. the other option is if there was a clause or date put into the contract stating the expiration of the contract if not excepted by the seller. Both parties can cancel/withdrawal the offer prior to conclusion of attorney review. hope this helps.