Originally Posted by
IndiReloaded
Oh, and apologizing afterwards does wonders.
As does warning your family before it is due...
Anyway - original poster - I get the impression you and your girlfriend are quite young (due to the nature of your question), so you should know that it is not uncommon for periods to be irregular for a couple of years after a girl starts to menstruate. Her hormones are probably just unstable.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?