Husband is going out of town during fertile window

I'm so frustrated. My husband and i have been TTC since September, but took a break during December..to avoid another September baby (we lost our first son), and because we were simply busy..but now I'm ready to really go at it this month. I just started my period, which i was expecting, but i was showing my husband my projected fertile window during January. Then he reminds me that he will be gone literally through the entire window. He'd be getting home on my projected ovulation day. It's not necessarily his fault, but im so effing frustrated i could cry.