My dh can't get off two days in a row

So. I'm in my fertile window. Got my fixed smiley (peak fertility) on my clear blue advanced digital ovulation monitor yesterday. We dtd yesterday evening about 7 pm. Tried this morning before he went to work and he couldn't get off. He even went limp. I'm freaking out. We just had a Mc last cycle, our 2 year old son passed away may 18 this year, and we've been trying for 10 months now. Idk what to do. We both want another so bad especially now its insane, but he can't get off but like once a week or so. Advice?