Back pain solutions

I am only in week 13 but i am having severe lower back pain. I am using Tylenol but it does nothing. I am sitting up straight and working on posture. I workout and stretch it out daily. I make sure not to pick up anything super heavy. My husband gives me a mini massage pretty much every night to help. I was told heating pads are a huge no. Anything else anyone has found that helps? I’m getting so desperate.