Hey mama! Based on your height and weight at 26 weeks, you're doing okay, weight gain during pregnancy varies talaga, and what matters most is na healthy ang baby and you're feeling alright. Best thing is to check with your OB during your next visit kasi they can assess if the gain is right for your pregnancy, especially since first time moms sometimes worry more (which is totally normal!). A few of my mum friends had different weight gain patterns and their doctors were fine with it, the baby knows what to do!