If he didn't come, her chances are pretty minimal, especially judging by the time of the month. It's not impossible, but it'd be pretty improbable.

Basically, if he had ejaculated earlier that day and hadn't urinated before they had sex, there could be some sperm in the precum, but those few sperm would have to live in her vagina until she ovulated again and then fertilize the egg. So, possible, but definitely unlikely.