I took plan b pill and a week later i eperience 2 days bleeding and brownish discharge i have a headache i dont know why.

About Plan B...: Taking Plan B or other emergency contraception pills can alter the timing or the quality of the current menstrual cycle bleeding and perhaps the upcoming cycle. One should check a urine pregnancy 3 weeks after taking Plan B, because Plan B works most of the time but not all of the time. If other symptoms or unusual symptoms persist, one can be evaluated by her primary care doctor or Ob-Gyn doctor.