I took Plan B about 12 hours after unprotected sex- he pulled out, but for safety measures I still took plan B about 12 hours later. I was supposed to get my period the next day or so, but it didn't come and I have not had any of the "spotting" I have read about. My question is can plan B mess up my period even 2 days before it was supposed to start? Because I am getting a little nervous I may my pregnant.
Yes, Plan B can "mess" up your next FEW cycles.
If you had sex 2 days before your period is due you didn't need Plan B. It is unlikely that you could conceive then as the egg would no longer be viable and you'd be at your lowest fertility.
You're experiencing a normal side effect.
Hope it helps.