I would do a back up contract as proposed below. I would also call in from time to time to check on the status. You may inquire about the contingency to see what it is. If it is the sale of the house you may ask if it has gone under contract. But you need a Realtor. See below.
Contingencies have a time period. You can inquire about that. I personally don't like to accept contingencies for this reason...it takes the house off the market when another better buyer comes along. When I do accept them then I add language that says if another offer is submitted then the buyer has to either remove the contingency or back out of the deal. If you don't have a Realtor, get one. You may be able to buy the house still.
Broker - Owner
Green Home Realty
Licensed Associate Broker
Accredited Buyer Representative
GREEN Designated Agent
William Raveis Legends Realty Group