The article seems mostly to talk about causes of stomach upset in early pregnancy, but something like twenty percent of pregnant women will stay sick right into the third trimester of pregnancy.
I know because I was one of those. If I ate too much, there wouldn't be room for it in my stomach and it would come back up--in the middle of the night! I took some over-the-counter medicine that my doctor had prescribed and just tried not to eat too much at once, especially close to bed.
Like the previous poster, @MissDaphne, was saying, everyone is different and it's so important to observe your own symptoms and what helps and hurts.