I really doubt it. The plan B was a bit of overkill. You added a whole lot of extra hormones to your already hormonally regulated body. So, I'd guess you are not pregnant but you may have some strange symptoms that 'feel like pregnancy' related to the extra hormones. You may have some spotting, you may have tender breasts, etc. To be sure, you can take a pregnancy test at 2.5 weeks after you had the sex. But would guess it is negative. good luck and come back and let me know!