Period like pains

Alleena
For about a week and a half now I've been having an uncomfortable feeling in my lower stomach (pretty much like having your period) except I'm on the pill and I'm not due for another week and I never get period like pains between my period (except a day or two before my period starts) 
It also gets really painful and crampy during sex
Does anyone know what could be causing this? (Not pregnant) 

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