Could the plan b pill cause delayed period and cramps for 2 weeks?

Pregnancy possible: The possibility exists. If you are one week late and still haven't had your menses, you should perform a home pregnancy test.

Possibly: Potential side effects w emergency contraception include: menstrual flow changes (spotting, bleeding, early or late period), nausea, vomiting, dizziness, fatigue, headache, breast tenderness & abdominal pain or cramps. Take pregnancy test & notify dr if your period is 7 or > days late.