Question: 8th month running hai
rat ko soti hu to back pain hota hai
so nai Pati aisa kyu
Your growing belly and increasing weight is the reason for the back pain.
Your spine is only supporting that weight hence the back pain.
Walk around for 10-15 minutes.
Improve your posture, keep your back straight dont slouch.
Dont wear high heels
Dont sleep on your back, sleep on your side.
If you need to pick something from floor try to bend your knees and pick.
Sit with back support.
Hope this helps.