Im 21wks now but when I was 17wks my lower back hurst so bad. I could not sit lie, or stand for to long. Heating pad worked for a lil put as soon as I stood up there the pain was again. So my dad had suggested to go to my aunt's pool which has jets but u can control the water temp. DO NOT GET IN A HOT TUB. but the jets worked WONDERS FOR ME. no pain since :)