Too tired for sex

Hubby is always too tired for sex by the end of the week. I get it, I'm exhausted too, but it's getting me down. This week is my fertile week and we had sex on Tuesday, but too tired since. Now I'm lying awake heading into Saturday knowing that it will be another month without a bfp. I've talked to him and he knows how I feel but he can't help it. And I'm not angry, I just needed to vent to a bunch of strangers on here :(