Feeling underweight

Halos 1kg pa lang nagegain ko na timbang (from 45kg to 46kg) , medyo nagduduwal pa din ako every morning at medyo picky sa foods. Hindi pa din kita yung baby bump ko. Pero may vitamins naman akong ini intake. Ok lang ba yun kahit na 15 weeks na kong preggy at nasa 2nd trimester na? Thanks po in advance