Honestly, the "twice a day" rule is more of a guideline than a hard rule, what really matters is getting enough calcium and protein para sa baby's bone development and sa nutrients mo for pregnancy, at milk is one easy way to do that. Some moms do milk twice a day, iba naman nakakakuha ng calcium from yogurt, cheese, or leafy greens, so it depends sa preferences mo and kung kayang-kaya ng tyan mo. The main point talaga is consistent calcium intake throughout pregnancy, hindi necessarily na exactly two times. If you're worried about how much milk you actually need or kung may lactose issues ka, best to check with your OB kasi bawat pregnancy is different.