Back pain😢

At which point of back pain do you think you should call the dr? Currently in AGONY with my lower back on both sides not so much the middle. Doesn’t matter if I stand, sit, lay on either side, I’m actually crying because of the pain. Idk if it even means anything just making sure! Also having a good amount of what I think are just Braxton Hicks (hopefully I’m only 36 weeks)