Normal lang yan, sis, a few of us din bumaba ng kilo or two in the first trimester, especially if you had morning sickness or just di kayo kumain ng maayos those weeks. Pero since you're 16 weeks na, better check with your OB next visit para ma-monitor ang weight gain properly, kasi importante yan for the baby's development. Palaging okay naman kung may slight fluctuation, pero your doctor lang talaga ang makakasabi kung okay na trajectory ang weight mo for the rest of your pregnancy!