I had unprotected sex with my bf on march 1. Within 24 hrs I took nowill 1.7 mg (levonorgestrel) tablet. My last period date was from 23 feb to 27 feb. Today its bleeding but not as heavy bleeding in periods. It is just spotting. It is dark brown in color. Is there is any chance of pregnancy? I'm unmarried and don't want to get pregnant?

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