Originally Posted by
atomic sagebrush
Ever since we found out about one attempt, I've always recommended having it at positive OPK (that is, for most people, the day before ovulation). This is not because timing sways, but because it's great chances of conception with one attempt and it's also easy to pinpoint using the OPK. Many people's cycles change dramatically when swaying so they can't rely on their old patterns to have an ttempt on a certain cycle day, so the OPK are helpful in that scenario.
So yes I do recommend that day as a good day to conceive with one attempt.