Does plan b cause ectopic pregnancy?

I recently took plan b about a month ago after an hour the condom broke on my boyfriend and I. I took a pregnancy test and it came out to be negative, but I am still waiting on my period. This lady told me she had ectopic Pregnancy after taking plan b. Now I am scared out of my mind! It has been 6 weeks since I took the pill and I feel fine but I sometimes feel like I could be pregnant. I did bleed a week after taking plan b , do I am guessing it worked and the test said I was not pregnant. Can a pee test detect an ectopic pregnancy? I was not worried until she scared the hell out of me! Now I am convinced there is something wrong with me! Please help! If you ever took plan b before, please share your story. 

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