Plan B - Double period ?

Claudia • 18 / in a relationship
Hey all!
About a month ago I used the morning after pill aka plan b after a little slip up.
The week during, I got my period that lasted 3 days (which is normal for me) then it stopped for 2 days, then continued to bleed for another 2 days which is odd. Has this happened to any of you? 
I also am currently a few days late for my period, is this from the double bleeding when I initially took this pill? Am waiting another week before I take a pregnancy test just in case.
Any advice would be greatly appreciated! 💜