Is BDing one time in the fertile window enough?

This is kind of a dumb question but I’m going to ask it anyways. As long as you have sex at least once in your fertile window there is a chance you can get pregnant right? I only ask because I’ve been doing OPKs and they haven’t gotten positive yet and I’m on CD 20. With my husband’s work schedule we may only get to BD once in my fertile window if I don’t ovulate soon. Hoping there is still a chance!

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