Plan b and birth control

Kerwine
Can plan B cause you to miss your period but I been spotting since Friday night I see brownish pinkish blood when I wipe but none on underwear my last period was October 19  I took birth control for 3 days then got off because bad reaction to it my boyfriend and I did have sex but we used a condom and pulled out I also took plan B on October 31my period has not came was suppose to be here today took 2 pregnancy test one Saturday and one on Friday both came back negative  but been spotting since Friday and having breast tenderness and cramping for about a week is that a side effect of plan B or birth control should I take another test if so when can this cause me to miss my period 

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