Ugh my BH hae been doing this. What tips me off that it's not labor is that my lower back is in no way involved, they are not rhythmic/regular and they taper off after a shower.
I've had these since 32 weeks! Even earlier. Doctor swore labor was close. But at 36.2 weeks there is not really an imminent sign. I've gotten clearance to resume activity as normal as they suspected she would be here once I commenced my normal activity level. Nope. Not sex. Extensive walking. Normal OCD cleaning has done the trick.
So no, I don't think it means labor is right around the corner but I definitely thinks it means you're in the home stretch with labor just a few weeks away!