I have the OneSource prenates from Walmart. I take them better when I'm not pregnant

I can't hold them down when I am. I tried to take the Expecta Lipil too, but that had the fish oil burps occasionally. I got to the point where I didn't even finish swallowing them before puking though, so I stopped.
My Dr. gave me a sample of a chewable prescription one, but those made me puke too.
So, yeah, I'm a lost cause.