I'm going for both...the pain is quite close to the spine and
@buggi's tale shows that its better to be safe than sorry. I'd rather get seen now rather than in a week when the pain may have subsided (or gotten worse).
The polyclinic does do imaging but like you say I doubt they'll offer it in my case and I don't think I need it. Pretty certain its just a soft tissue injury.
Anyway, I'm here now and they sent a nurse straight over to ask me what happened to check that they will be able to see me and they will, so that's good. 2 hour wait, but I've got my laptop.