Conceiving 3-4 days before ovulation?

Millie
Is it possibly to conceive 3-4 days before the big O? My hubby works out of town and we don't get to DTD as often as we like during my fertile window and Sunday will be our last day to do anything before he leave out again, that'll be 3-4 days before my ovulation? We are using preseed this go round also. Any input? Thanks ladies