That would be very tricky so good luck, I am doing O+12 so 12 hours after ovulation and making sure your DH sperm is acidic and you have an acidic inviroment cause thats what the girl sperm like apparently. there is alot of info on the net about it.
At the end of the day its all up to luck I suppose but this is what we are trying as this will be our last baby aswell.