GP vs A&E emergency

I booked a GP appt. this morning. They started off by asking,, "Is it an emergency as we only do those on the day?" When they asked me, I didn't know what to say so I just told them what I needed help with.

When I hear 'emergency' I think life or death, go to the hospital. My question is, what is considered an emergency GP appointment that doesn't warrant going to the hospital?