Hello Memmil, what soil media do you have it in? I see some fiber strands, what else is in there?
Typically as Baja mentioned, it is normal for the lower leaves to drop. In your case, the leaves seems very green then drops, it maybe getting too overwatered I think. But do adjust your watering regimen, every week is rather too frequent especially if you are growing it indoors. I leave mine in a container outdoors and I really give good intervals in watering.
Feel the stem and branches, it should remain firm. If you can, you can carefully inspect the root section, invert the pot and gently pull out the plant to see condition of the roots.
I do not know what your location is and your general temperature range there. Usually crassulas go slow in growth when it gets too warm, then start perking up again when temps are cooler.
You can also try and replant those leaves, lay it on top of soil. If it is still okay, it should still grow roots and begin a new plant.