expectant mother

I heard someone once say that waiting adoptive mothers are also "expectant mothers". You don't have to be pregnant to be "expecting". I am trying to see myself as this while I wait on a potential job offer. We desperately need the money to pay for the adoption expenses. Me working will make the difference in paying up front or taking out a loan. How do a tell a new employer that I really am "expecting", I just don't have a due date? I want and need the flexibility to put the quest for our child first. I pray that what is meant to be will and that things will fall into place while we are expecting!