Should I be worried?!

Noora
So I'm 16+3 weeks pregnant.. I didn't suffer the rough nauseous thankfully, but since i got pregnant i lost almost 4 kgs.. Though I'm eating well and not doing any exercises.. My husband is really not happy that I'm losing weight and he thinks I'm not eating well.. I'm worrying that it's not a good thing and if it will harm my baby.. So any advice? Btw: I still didn't get to a doctor yet but my first appointment will be on feb 22nd..