I think prenatal pills are the worst thing about pregnancy

!! They make me sooo sick: nauseous and with a headache! No matter when I took them, even after eating I would be sick for an hour and a half after taking them, I would say that with my first pregnancy I only took them about 2 times a week....I didn't even finish a bottle!!! I just couldn't take them!! But my son was born very healthy!
Right now I am only taking folic acid, I only got sick with them one time, I took them right when I work up with no food, but when i take them later on during the day I dont feel a thing!