rib pain

Ok bit of an annoying thing. I've had this stitch/ burning shooting pain under my rib for the past week. It hurts whether I'm lying down, sitting or standing, nothing seems to get rid of it. It's not directly under my boobs,  it's right at the bottom of my ribs on the right hand side, when you press my ribs, it's the lowest point you can feel. 
It's absolutely agony.. I'm 37+ 5, just wondering if anybody had any ideas of what it could be... also my back is aching ( just assuming that's normal pregnancy) this will be my second baby.
Thanks!!