Aww congrats on baby! Honestly, hindi unusual yan lalo na kung fresh ka pa lang gumaling sa morning sickness, a few of us moms went through the same thing at hindi agad bumalik ang appetite, so the weight gain took time to catch up pa lang. The good news is na you're past the palaging pagsusuka stage na, kaya hopefully mas lalaki appetite mo in the coming weeks habang lumalaki baby mo. That said, since you're 20 weeks na, mas okay talaga i-check with your OB kung okay lang ang growth ng baby mo despite di pa sya nag-gain, because sometimes may factors na importante na makita sila just to be sure everything's on track!