Could I be pregnant? Please help?

Anonymous
Last time I had sex was nearly 3 months ago, but my periods have been short, scanty and weird since then. I took plan b 3 months ago immediately after having protected sex. This month my period didn't even show up. I'm almost 2 weeks late! I took a pregnancy test 2 days ago and it was negative, but I'm deathly afraid that I could be pregnant since my period has never been this late in a while. Help
Could I be pregnant? Please help?
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