Plan B Effects
Plan B Effects can occur and in most cases but they either require no treatment or are easily treated by you.
Here are some plan b effects that you might feel :

Nausea (slightly common)
Fatigue
Diarrhea
Dizziness
Vomiting
A heavier menstrual period
A lighter menstrual period
Breast tenderness
Stomach pain
Headaches
Most of you will get their period on schedule after taking Plan B pill, although sometimes it can delay a period by a few days. If your period is more than a week late, you should take a pregnancy test to make sure you are not pregnant. Plan b pill is not 100% effective.