Does plan B harm an existing pregnancy?

I had unprotected sex last night and took plan B this morning. I posted about it in another support group and they’ve acted as if I’ve taken an abortion pill. The box says it doesn’t harm existing pregnancies but now I’m doubtful. I would never knowingly end a pregnancy that had already developed I was simply trying to prevent it if at all possible. Bought a pregnancy test to test in about a week or so...

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