Hi, quick question regarding uterus position/rib pain

[new mummy h]

ive been getting the same on my left side! hurts like hell xx

 

[EmmaMarch2010]

I experience rib pain under my breasts when Im trying to sleep on either side. For any length of time it then starts to hurt, and it wakes me from sleep so I keep changing sides. I think its all normal and though not excrutiating, it is uncomfortable and makes me feel breathless.