Back pain

Hi, I’m currently 25+5 weeks pregnant and just wondering what everyone’s experience with back pain is and what’s normal. This is obviously my first pregnancy so I have no idea.

Since 19-20 weeks been having upper back pain once it gets to 5pm which I get is normal due to weight gain etc but for the past 1-2 weeks I can’t sit down without shooting pains mid back and some pain in my right rib area. I’m ok if I stand but am only really comfortable if I lie on my stomach but don’t think I’ll be able to do this for much longer. Just wondering if it’s the same for everyone.

I am naturally small - 5’1 and was 47kg before pregnancy so don’t know if this contributes. Attached a photo so you can see size of bump now.

Any experiences or advice to help would be greatly received.