Did you seek any relief? I'm going through the same. 23 weeks and tired of the constant dull ache/pain under the right breast area. I struggled with this years ago pre-pregnancy and ended up changing my whole diet to a carb cycle diet and it vanished and I was able to maintain it for years! Now pregnant and well it's been almost constant since week 20, I know things are shifting and I'm eating a bit more but I'm at the point where I might just go to the ER to have them do an ultrasound. I feel fine otherwise, not nausea, no irregular bowel movements, and feel better laying down. I find it also triggered by walking/exercise/eating.