I'm taking the Jamieson prenatals ... do you have that brand in the US?
My only caution with brands would be to compare the list of vitamins/minerals. I also bought a huge thing at Costco (can't remember the brand) - it had the same list of ingredients as the Jamieson, but sometimes in smaller
quantities. I decided the extra cost was worth having the extras.
As for the pills making your stomaches feel upset, do they not recommend taking them with food? If I take mine with food (breakfast, specifically) I feel fine. One time I took the pill then someone walked into my office, and 5
minutes into the impromtu meeting I felt sick (like bile rising in my throat sick!) and couldn't wait for them to leave so I could eat! A few bites into breakfast and my upset stomach subsided.
As for horse-size pills, I find after one or two they aren't a problem to swallow.