I agree it might be a pinched nerve. I see a chiropractor monthly since my back is too straight and I get compressed in 2 areas - between the shoulder blades and at my waist. The pain can radiate in the weirdest directions, like my hip or lungs. See if your insurance covers chiropractic, and ask for others to recommend one (not all are equally good, just like doctors, some just want you to keep coming so they make as much money as possible, but mine truly cares for my well being and lets me decide when to come). It is very possible that due to the hormones that loosen the bones to let a baby pass through your pelvis, that other bones in your back also loosened and just never settled back into a pain free position. It is also possible that you have always been slightly out of kilter, but that with youth and flexibility you never noticed. A physical therapist found that my left leg is about 1/4" shorter than the right, which is also adding to the hip pain as well as foot pain, but never noticed it until this age (I am 50). So perhaps a physical therapy assessment is needed. That one did require a referral from my primary care. It is very possible that you do not have to live with this pain so make the time to find some answers.