Sonya, we need you to elaborate before we can give a correct answer. Are you talking about contingencies that the first position buyermay have so that you could step into their place should they rescind based on findings of some information? As others said, purchase contyracts can be contingent upon MANY things such as financing, inspections, appraised values, upon the buiyers selling their own home, etc.
Tom brings up another point.
Please tell us exact details so that we may provide accurate advice. I must ask though---what does YOUR AGENT say? Did you pose this to him/her? Do you not feel confident enough with their ability to answer or what their answer was? And, we are speaking in generalities, as we do not represent you and do not have law licenses.