5W5D pregnant and losing weight,normal????

Netty • I am a 29 y.o Mum of one (5years old) expecting baby#2 with BF of 10 years
Did anyone of you have lost weight ever since they've found out that they're pregnant? I've already lost 1kg without even dieting although i am eating lot of fruits lately my habits have not changed yet.i am not craving food yet and I think I am eating normally,no nausea,no vomiting but water is starting to become an issue for me and I am scared to dehydrate.
​Is it normal to lose weight at early stage of pregnancy