I've been in a bit of pain since yesterday afternoon. (it's now morning here

)
Similar to menstrual cramps. At the bottom of my abdomen in the middle.
They're not agonizing but they're quite uncomfortable.
I thought it was maybe stomach related but it doesn't seem that way. My gynae is in surgery all day today so I'll only get hold of him tonight. I'm going to phone if the pain doesn't go away but has anyone got a clue as to what this might be?
It goes if I walk around. It isn't regular either. Kinda comes and goes at different intervals.