Ay sis, ganyan talaga ang first trimester, ang pangangasim is one of those annoying things na parang laging kasama mo! A few of us moms tried eating small, frequent meals kaya hindi ganong intense ang acidity, at pati ginger tea or mints helped dull it a bit, pero honestly, since you're at 12 weeks pa lang, worth mentioning sa OB mo next visit para may mareseta siya na pregnancy-safe, kasi some moms namin swear na antacids talaga ang game-changer. Hydration din helps, kaya siguro try drinking lots of water throughout the day instead ng dami-dami at once!