My back and side started hurting where my right kidney is about a week ago. I got tested for a kidney infection but there was no sign. Since then the pain has spread to the left side and it's making it difficult to walk anywhere because standing/walking for more than a minute leads to sharp pains in my mid back and sides, under my ribs. It seems too high up to be pelvic girdle pain. Massage makes it worse and heat only helps while it's there, it's unlike any other back pain I've had. Any ideas? Just the weight of the baby causing it? I'm 37 weeks. I've ordered a support belt and I'm hoping that will help with walking!