OVERWEIGHT WOMEN! Have you used plan B and it worked?!

I took a plan B on Friday the same day of unprotected sex. I found out today that apparently it doesn't work for overweight women and I weigh about 200lbs. Is it true that it really won't work? Has anyone near my weight taken it and didn't get pregnant? Also my cycles are irregular so I have no idea if I was ovulating. I do plan on testing in two weeks if I don't get my period too.

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