Yes, it is generally safe for pregnant women to drink nimbu pani (lemon water) in moderation. Nimbu pani is a refreshing and hydrating beverage that can provide various health benefits during pregnancy. However, it is important to keep a few things in mind. First, make sure the lemons used are fresh and thoroughly washed to remove any potential contaminants. Secondly, avoid adding excessive amounts of sugar or salt to the nimbu pani as this can lead to unnecessary calorie intake or increased blood pressure respectively. Lastly, if you have any specific concerns or medical conditions, it is always best to consult with your healthcare provider before making any dietary changes during pregnancy.