How long does Plan B mess up your menstrual cycle?
Answers: I took it and it messed me up for about 2 months, but you should check beside your doctor or take a pregnancy check just to be sure though it's be my experience that plan B can mess up your cycle for a few months.
You should get your conventional menstrual cycle in roughly 1-2 months. If not you should contact your OBGYN. THE REASON FOR THESE LIGHT PERIODS IS BECAUSE YOUR PROBABLY LOSIN WEIGHT WHEN YOU LOSE A DRMATIC AMOUNT OF WEIGHT THIS COULD BE THE MAIN CAUSE OF THIS EVERYBODY IS DIFFERENT BUT IS JUT A SLIGHT CHANGE IN YOUR MENSTRUAL CYCLE
I'd say it's pretty typical for it to mess up your menstrual cycle for at smallest two months, and could for as long as around 3 months.