Losing weight while pregnant?

So I’m 25, 5’7” and started out TTC at 230 pounds... (overweight). I went on a diet and lost 10 pounds the same month I conceived. Now that I’m pregnant, 18 weeks today, I’ve lost 12 more pounds. (NOT DIETING)

At first it was because of nausea. Now it’s a constant feeling of being full, even when I’m starving I’m only able to eat a small portion of anything.

I mean I’m still considered overweight at 208 but does anyone know if this is safe or normal?