Plan B - late period

Hey guys so I took plan B in March, I had my normal period on the 10-26 and my period usually comes on the 11 then after plan b I bled again in March from 25-27
In April I got my period around the 23 
But right now, in May I have not yet gotten my period. I highly doubt I am pregnant as I use condoms and even tho I let my boyfriend put inside w/o a condom it was very quicky.
Could that be a PLAN B side effect? Help