Bowel movement after RNY

Starting to panic & will call Dr. tomorrow. Had surgery Wednesday afternoon, & haven't had a bowel movement, nor passed gas-don't know if it's psychological, scared to pu****ook MOM, & have been getting lots of fluids. Also walking lots. Anyone else have this trouble in the beginning? I don't recall if I had this bad constipation after sleeve. I know the codeine affects this, but definitely still need it for the pain a couple of times a day.