Hi,
I'm 21w4d today and I have this strange dull pain under my ribs on my left side (I had it yesterday evening and again today, started around lunch time)
It is on the lateral going to the back a bit rather than front.
It's not sharp, it's dull and it comes only mainly when I sit and it goes away after I change position. I don't feel it when I stand/walk and it doesn't hurt when I breathe.
Initially I tried not to worry and put it down to stretching/growing pains but a friend of mine who finished med school a couple of years ago said it could be my spleen or the pancreas?! That totally scare the shit out of me 
Has anyone else had this?