Positive OPK only to have my DH missing in action..

I justed got a BFP OPK and my DH is working late. He'll likely be too tired for BD. I'll try not to be too disappointed if it doesn't happen, but I can't help myself. I'm hoping it's a 36 hour and not 12 hour window for O. 
When you have a BD timing issue, how do you all deal with the disappointment?