I'm 36 weeks but no back pain yet. However, I do have a lot of lower abdominal cramping like period cramps....I try to walk it off and change positions and take hot showers.
Can also be Braxton hicks... time the tightening ur having if it lasts for so long call ur doctor or go in
I am 37 weeks and having back pain too. It's perfectly normal. I'm on my second pregnancy. I use a hot water bottle on my back the heat helps. Try that and keep moving positions if you are standing or sitting.