upper right quadrant pain that radiates to the back?

i’m 20 weeks and i just started having this pain, it hurts when i stretch out.

not sure what it could be? i got scared and went to L&D and they said my placenta is low and my cervix length is 4.1cm. hopefully the placenta moves upward!

but not sure what can be causing this upper right side quadrant pain? i’ve been having it for two days now.