I know that there's probably been thousands of discussions on backache , but I'm wondering how you would describe yours - is it like period pain, stretching pain, pulling pain, throbbing pain etc etc?

I'm 18 weeks, and today (for the first time) I've got a heatpack on, but the aching is a little higher up than normal - more like it's just below the back of the base of my ribcage or something and it's kinda like a heavy feeling - anyone else experienced this?