It is normal for us girls to have these sort of symptoms, and they can vary from month-to-month. I mean, sometimes I have period pain, and sometimes I don't.
It is probably nothing to really worry about. Take a Panadol maybe. However, if it is still like this afterwards, maybe you should go see a doctor? =)
It could also have been from outside. Was it a cold night?
Hope you feel better soon <3