Good news? Not good news?

Well, I'm really trying to be happy about this. We got an email from our agency today with really wonderful news-- really. Our social worker announced that she is 6 months pregnant with her first child. Isn't that wonderful?? Yes, I thought so. Until I realized that new baby = maternity leave. Now, I really have no right to worry about this, because truly, it is all GOD'S timing. But of course I am worried. What if we don't find our little one before she goes on leave in April? How is the replacement SW going to be? Will she be as diligent? What if she decides to take more than two months off when she realizes her baby is sweeter than she imagined?? So many unknowns, I'm really trying not to let my head spin. Dear Lord, help me be patient.