TL;DR: No, we are not expanding. The phrase "expanding universe" is most attributed to the empiric evidence of red shift of the photons we see from outer space. But the red shift does not mean that the space fabric itself is expanding, it only means that photons and their frequencies are not simple local phenomena, they depend on relative aspects of space and observers. The frequency of a photon is not best seen as just the photon, it is more accurately described as source/photon/observer system.
The distant galaxies that are sending photons are indeed moving away relative to us as observers. But the atoms in the earth, and inside your body do not expand in the same way, and the space fabric/ether itself, "the grid of coordinates" that the earth sits in does not expand.
The distant galaxies that are sending photons are indeed moving away relative to us as observers. But the atoms in the earth, and inside your body do not expand in the same way, and the space fabric/ether itself, "the grid of coordinates" that the earth sits in does not expand.