Bruce is correct. If there is only one signiture on the contract, you do not have a legally binding contract, just an offer. On the other hand, if you do have a signed contract the terms of whether you can, "pull out," should be specified in the agreement. I recommend you share your concerns with your Realtor. If you do not have one, I would be happy to take a look at the agreement and give you my opinion, however if you did not use a standard contract, you really should be seeking the advice of an attorney. Again, if you do not have one, let me know and I can give you some options/names.