losing weight- 9 weeks

Ja
Hey ladies...
I'm a solid 140lbs and I'm 5'6" so I'm not super thin by any means. I was 145 before getting pregnant. The babies were checked last week and they measured right at 8 weeks. I can't help feeling bad that I'm losing weight though. I'm just so sick all the time. Anyone go through something similar and babies are healthy and big?? When does the sickness go away so the weight gain can begin?