It’s very common to experience low back pain in your second and third trimester of pregnancy. A simple low back stretch you can do in your shower is a modified cat and cow. The heat from the shower along with the movement will relieve pain and discomfort in your low back. See below to perform “modified Cat and Cow” in your shower.
Modified Cat and Cow: Standing under your shower bend over and place your hands on your upper thighs. Inhale and sway your back and look up, exhale tuck your pelvis under and look down. Repeat 8-10 breathes.