17 weeks tapi berat tak naik naik

My pregnancy dah masuk 17 weeks.. Tapi berat tak naik2.. Mula2 buka buku pink Haritu 44.4kg.. Pastu next checkup 44.1kg.. Then skrg sy cek 43.8kg.. Risau.. Makan tu Mmg makan.. Kenapa berat tak naik? Is it bad for me and my baby?