no weight gain

Well girls , I'm 16 weeks 3 days with 20 lbs weight loss no weight gain and I am very worried , this is my second pregnancy & it is a girl . My 1st was a boy and I gained roughly around 42 lbs . And now I'm just scared . I was in the beginning having hypermesis but it's calmed down a lot . Is it healthy that I'm not gaining any weight ??