What does it mean if you're period doesn't come but you have a bit of cramps (very very little cramps)?

If your period doesn't come does that mean you're preagnant? Even tho you have NEVER had sex in your life and your a Virgin? (But you did some stuff with your boyfriend but just not sex) or if not why else could it be? Help I'm so worried right now. I also have cramps but no period!
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+1 y
I also took antibiotics
What does it mean if you're period doesn't come but you have a bit of cramps (very very little cramps)?
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