Anak, na-worry ka talaga, and I understand, but please see your OB right away, especially with 38 months na, okay? That sudden weight gain in just a few days could be a lot of things, but preeclampsia is serious and needs proper checking, hindi guesswork lang. A few of us mums experienced rapid water retention during late pregnancy, pero dapat talaga ma-confirm ng doctor kung normal lang siya or may underlying concern. Don't wait, go today pa lang if you can, better safe, especially sa last stretch ng pregnancy mo. Take care, mama!