Sobrang unlikely talaga, ate! Based sa cycle, kung nag-period pa lang siya ng 5 days ago, she's still in her menstrual phase and hindi pa fertile window, that's usually around day 12-16 of the cycle depending sa regularity niya. But honestly, every girl's cycle is different, kaya kung worried siya, best na mag-take ng pregnancy test after two weeks or mag-consult sa OB para ma-ease ang mind niya!