Am I pregnant? HELP!!

I have unprotected sex November 1st 6 hours later took plan b, a week later I got a brown discharge that lasted 4 days, after about a week I was experiencing nausea, tender breasts, and dark arieolas . I was suppose to start period the 21st of November didn't receive it 5 days after I was late I took a test and came back negative two days later I took a test and came back negative, currently I am about two weeks late... I'm not sure what to think?? Am I pregnant or is it the plan b? 

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