the baby could be sitting/laying on your siatic nerve. its nothing to be worried about its completely normal to have back pains and it can be more on one side or another just because the baby can be laying on one side more than the other. if the baby is laying more in your back it can cause it but with it being more than the other i bout gurantee that the baby is just laying on that side more which he/she could be laying on the siatic nerve which can be painful. (i have had 4 so i know the feeling) hope you get feeling better.
im 20 weeks pregnant and im having bad back pains on the lower right side above my hip should i be worried? . i still feel my baby kicking alot and i dont have any tightness in my abdomen just on my right side and my right leg is cramping as well.