Its the trimester for aches and pain. Baby will triple weight during this time and will likely want to make more room. And the stretching and pain is part of it as the uterus will be forced to expandceithin a short period of time. So far the pain I have experienced is bearable pain. Pregnancy excercises do help too
I am also having rib pain on the right side....went to my 30 week sono and found out babies head is right there ....try rubbing the area and sit up straight don't slouch cause if its the baby slouching will just create more pressure
I used to just rubbed it when my daughter were getting her legs inder my ribs and she would move for a bit :) with this one...she is positioned across at the moment so no rib pain yet :)
Hope it gets better for you.