I actually was gaining weight around that time but that was before my morning sickness kicked in. I'm 11 weeks now and found out that I'm one pound under what I was prior to finding out I was pregnant.
It is normal just make sure you drink alot of fluids and at least try to eat fruits and veggies. Whether it stay down. Also eat in small snack portions. You will start gaining in your second trimester.
My doctor said it's fine so don't worry! !
I Don't Know If It's Normal But I AM Losing Weight and I'm just 7 weeks. My face is thinning out and I'm fitting into a 2 size smaller. Doctor said it's OK