When should i BD?

With my last 2 cycles i did a 3 day cut off.
Apparently i doenst really work for me because i'm not pregnant.
O day would be 24 september. My husband will not be home then.
When should i BD? Today of tomorrow? I know timing doesnt work and one attempt does but you never know..

If your husband will not be home I'd have the attempt at the last possible moment before he leaves to ensure you're covered for as long a time as you can.

If you want to keep timing, though, just have attempt on the 22nd, that is still a Shettles cutoff, but is much better chance of conception than the 3 day cutoffs.