Try at night. I'm not a big fan of my prenatals the doctor gave me but they only cost 85 cents with my insurance so I can't complain. In the beginning I tried everything with them...taking them with different liquids, foods, at different times, etc. the only thing that helped was taking them at night because I'm sleeping so I don't realize they make me feel bad (or at least they once did)
I couldn't take them for the first 14 weeks as I was constantly sick. Once I started to get over the all day sickness I started taking mine every night right before I went to sleep and have been okay! Good luck!