Ay mama, honestly yan ay possible talaga kaya better na mag-take ka ng pregnancy test na hindi ka maghintay pa, especially na regular cycle mo kaya ang 6-day delay is def worth checking! A few of us mums in our circle nag-experience din ng breakthrough bleeding or delayed period even sa withdrawal method kasi technically hindi 100% foolproof, so the safest way is na magpa-test ka na para sure at you can plan accordingly, wag ka nang mag-antay pa ng more days, kasi the earlier you know the better.