I took plan b in November right before my period on the 9th. My period came as normal 14-17. Then I did not have another period until January 28-31, which was a 76 day cycle. I was hoping my period would be back to normal by now, however I have not received one since the end of January. I have had protected sex one time. Is it the plan b messing with me, or should I take a test just to be sure that the protection worked? Please help!!