Reasonable goal?

In about two months my husband will be released and start his journey home for mid-tour R&R (two weeks of leave to come home while deployed), Ive lost about 20 pounds since he left. I would like to lose twenty pounds before he gets here. Im not sure if its reasonable, but if it is I would like to know what I can change to make sure it happens.

Currently: Five foot one and 163 pounds. My starting weight was about 185ish.

I follow a low/zero carb diet (DR says its the best diet to help with my insulin resistance) and workout 4-5 days a week.