It's normal. I've heard of some ladies who lose up to 25 lbs. I Myself have lost about 5 lbs and I'm 15 weeks.
I've lost around 15-20 pounds from extreme vomiting. I'm still spewing at 21 weeks :(
Don't worry over it, is pretty normal. I lost 16 pounds during the first part of my pregnancy. I am now 30 weeks and I still haven't fully gained what I lost. If you're worried just talk to your doctor :)
It's normal in the beginning. I lost 30 pounds in my first trimester due to all the vomiting and nausea.
Thank u so much for your feed back ladies!