Took plan b & started bleeding a week later it was not her period cuz it only lasted 2 days. is this abnormal, she still has not gotten her period.

Typical with Plan B: Plan b essentially disrupts the normal menstrual cycle by blocking or delaying ovulation. That it is how it works and why it is so different than a medical abortion. Irregular bleeding after taking Plan B is not rare. Always check a pregnancy test after using Plan B and see a doctor to start a better form of birth control. You need a better plan than this.