I'm 5 months, and I only recently stopped throwing up.. It's different for everyone, some women don't get sickness at all.. Then there's us unlucky ones who suffer for months =p

as for losing weight, if it's a serious amount or if it's due to an eating disorder then yeah you should see your doctor, but otherwise i'm sure you'll start piling the weight on soon, as your baby gets bigger and bigger! =)

You should definitely mention it to your doctor at your next appointment! And if you are unable to eat anything due to morning sickness, you should get checked out. There are medications they can give you. They don't always work - but it might! Make sure not to get dehydrated!

Weight gain/loss in the first trimester is not a concern. It is in the 2nd and 3rd trimester when you start to gain.

Hope your ms eases up soon!