Why we have period pain?

I dont receive it. what is occurring inside my belly during period? and why some girls own discomfort contained by their back? and what is up when a feminine have PMS, why is that twinge and stuff?
Answers:

Is she pregnant?

During your time of year, your hormones fixed blood supply to your uterine muscles. Thos muscles contract adjectives the time, but immediately they contract lacking greatly of blood so explicitly why your uterus, not your stomach, hurts during your length. I'm fraid I can't answer the support interrogate.

are home pregnancy test reliable the light of day after sex?

Short and simple answer is "hormones". Your body have a "28 day" cycle. (most women) Here is a contact that explains everything you only asked going on for.

http://www.coolnurse.com/menstrual.htm...