Losing weight while pregnant.

I'm 10 weeks pregnant and my morning sickness has been plain awful nothing I do seems to help and if it does help it's for a short period. I stay so tired that I don't do much. I am trying to stay active but most days i have no energy just takinh a showrr and getting my daughter dressed wears me out. I workout 3 times a week. I weight 230pounds when I got pregnant and have lost 10 pounds. Is that normal? Should I be worried?