Hey my period is late by 6 days and im normally not that late for my period the latest ive been is like 2-3 days late its never been six ?

It happens sometimes: In a teen with regular periods, some causes of a late period include: pregnancy, excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy tests are very accurate by 3 weeks after sex.