Rib/back pain

So I’m really conflicted, I hate going to the hospital. My reasons being I never leave with an answer to why I come in, I’m not sure if what I come in for can be considered an EMERGENCY! I’m 26 weeks pregnant and I’ve been having this pain under my mid/lower ribs while also in the same exact spot on my back, I’ve had it for awhile with this pregnancy and was always able to avoid it by sleeping on my left side. However these past few days this pain has become so uncomfortable that even if I’m sitting down lying down in any way and even standing it just doesn’t go away. I told my ob who suggested it may be my gallbladder and ordered an ultrasound for Monday, and if not go to the er if the pain becomes unbearable, but Monday is 2 days away and I’m just not sure if I should go to the er. I know it’s not baby because I’m positive it started before she was even kicking, and I’ve just now started feeling her higher. I’ve also started having random pains in my chest, and aches in my shoulders and hip but their could always be a possibility that those are from the pregnancy and not so much alarming as the pre existing pain in my ribs/back that hasn’t gone away or got better. Please help with advice.