Sudden achy uterus again at 15+5?

[weeblueberry]

I had quite an achy uterus back at week 11-13 or so, obviously because there was a lot of stretching and moving involved at that stage. It went away for a couple of weeks but for the last 12 hours or so has been a little sore again. No major pains and certainly nothing cramp like or particularly painful. It just seems odd that it stopped...and seems to have started back again!

Anyone else had this?

I'm 20 weeks and it does seem to come and go every couple of weeks. I am expecting this to happen throughout as there will be pretty constant growth, and then movement from the baby.