weight loss during 2nd trimester is it normal?

I'm in my second trimester. Nung first trimester ko naggain ako ng weight pero hindi masyado dahil sa loss of appetite. Come my 16th week ok na yung weight ko normal weight gain ko. Pero nung 17-18th week ko nasa nagtaas na sya to 61.9 kg from 59kg then ngayong 19th week nasa 60.5kg na lang ako. Is this normal? Hindi na ako nagsusuka or anything and i'm still eating same as before