I'm 17 weeks today and I've lost 21 pounds ( now 109 pounds) due to morning sickness and metabolism. As long as you're eating healthy, and keeping active and feel okay, you and baby should be fine. Talk with your doctor just in case but a lot of mummas lose weight before they gain it :)
I lost weight when I went to my first drs appointment also due to my morning sickness.
I'm 14+2 and Ive lost 16 pounds from changing my diet, morning sickness and not being able to eat. Doctor said it was fine