Should i be worried...

Almost 15 weeks atm. Decided to jump on my scale this morning because i have been losing weight and im sick with a cold. Im not sure is its normal but ive lost almost 20 pounds since i got pregnant.. Is that normal? 😕 my hubby seems to think its good cause when i do start to gain i wont gain as much. But its making me nervous that im constantly losing weigh. Ive only thrown up once this whole pregnancy so to me i shouldnt be losing. Maintaining if anything.