FTM Intense lower back pain

My back is KILLING me it hurts to walk it feels like pressure or like soreness down there when I get up or walk. I have been experiencing Braxton hicks the past month. I use a heating to get some relief but today it just feels so INTENSE when walking, from sit to stand and getting up from bed even my lower belly hurts or feels like pressure there if that makes sense lol

I'm 35 weeks baby is head down and I've carrying low so I'm sure this pain is coming from that

Is this normal? Is there anything else I can do to relieve some of the pain?

I do exercise/ stretching for it but it doesn't help much