My whole pregnancy ive been taking walmart brand of the one a day that has the omega 3 fish oil plus the prenatal vitamin but they were out 2 days ago when I went for more so I grabbed the one a day brand because it was the closest thing they had to the others. Ive taken them 2 nights in a row and within an hour ive felt very nauseated with stomach pains and have to use the bathroom. Has anyone else experienced stomach issues with that brand? Ive never had any issues with my other ones besides the fact id belch fish oil and it would make my morning sickness worse but once I started taking them at night that didnt affect me anymore