I am 21 years only and my period is about 8 days late and I took a
pregnancy test yesterday that was negative, it says on the box to try agin in 3 days if nothing changes, which I plan on doing, but I was wondering how common this is. It has been a particularly stressful month, and it's midterm season so I'm thinking it may just be stress. I've found some conflicting evidence on line saying I should I see a doctor now or that this happens and I can wait until next month if it happens again.