Aw mama, stomach and back pain during pregnancy is super common, lalo na as baby grows, nangyari din yan sa amin at sa most of my mum friends, pero importante talaga na check mo with your OB para sigurado lang kung ano ang cause at if everything's okay with baby. Try resting more, warm compress on the back, at stay hydrated, alam mo, sometimes dehydration makes it worse din. Hoping you feel better soon!