Are these signs of labor on its way ?

Im 37 weeks pregnant and my baby keeps tightening up like braxton hicks contractions. Very uncomfortable. My back is aching and hurting and there is alot of pressure on my lower half causing me to pee every 5 minutes!! I have discharge also but i think its normal. Does this mean labor soon? My baby is back to back also so how I can I help her change position before the big day?