I think some girls might be working with 6 day fertile period. To concieve faster u should narrow it down to 2-3 fertile days. Which if u go by glow it would be the last 3 days of ur fertile window. The last day of the fertile window should be ur actual ovulation Day. So I feel like some girls might be doing the deed too soon. And then the man might not have strong swimmers left when Ur actual ovulation day arrives. Try doing the deed (last 3 days) of ur fertile window. It worked for me. So maybe this will work for you too! Good luck baby making ladies!!!!!!