Sometimes throughout the day I get pain/pressure in the top of my torso like right under my boobs.  It feels like there is a corset there tightening around me.  It is only at the top, not low down at all.  My sis thinks maybe it is because I'm slouching at work (yeah I do).  But it is happening more and more.  I'm 19 weeks.  Anyone else have this or know what it might be?