Do premenstrual cramps come before your period?

I usually get cramps during my period. But this cycle is kind of weird because I’m having cramps but my period hasn’t started.

I had sex 3 wks ago. I don’t know if I’m late or if this is normal for me to have cramps before i start my period hence the term ‘pre’ in prementrual cramps.

Does anyone experience this? and how long does it last until your period starts?

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