Hindi naman masama ang malamig na tubig sa pregnancy, sis, marami sa amin nag-inom normally lang throughout, pero kung concerned ka talaga, mas maganda i-check with your OB kasi bawat pregnancy ay different, especially pag may ganitong worries ka! Ang importante lang is hydrated ka throughout, kaya kahit mainit man o malamig, as long as safe sa'yo and baby, go lang! First time mommy jitters talaga, pero you're doing great by asking.