cramps & lower back pain

A`Lexsia • Never had period tracker "APP" that's been this amazing , I love it
I woke up early this am around 3 -4 and I was cramping as if I were on my period and my lower back is killing me . Any idea what this could be ? I'm not on my cycle it eneded Christmas Day and I had unprotected sex on the 28th . 😩, any info will help please 

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