Sex just once during fertile week?

Has anyone had sex just once in fertile week and gotten pregnant? Technically ending my fw right and and most likely will tonight - but I already feel out 😕

Normally we bd every day..or every other day during my fertile week..and also before..but my thoughts are - if that doesn't work..one time leaves me with no chance.. 😢..my only hope is that the cd we bd on was the day I ovulated last month (and we also did a couple days before..)..but I know that can change month to month..even though I'm very regular so that doesn't make me feel any better.