Yes. There are several short term side effects to taking the Morning After Pill. These may include:
 
1. Nausea and vomiting.
2. Irregular and unpredictable menstrual periods.
3. Cramping and abdominal pain.
4. Breast tenderness.
5. Fatigue.
6. Headache.

In addition, the cramping and abdominal pain that may result from use of Plan B^® may mask the symptoms of an ectopic pregnancy, a potentially life-threatening condition in which a fertilized egg implants outside of the uterus (most often in the fallopian tubes).