16 weeks pregnant and have severe nausea and vomiting and at the er, passed out took samples but no iv fluids, shouldn't we be hooked up to iv?

Probably.: I would normally agree. Have you seen the doctor yet? Are you dehydrated? If the nausea and vomiting just started, perhaps not. I would agree that at least a flushed IV is appropriate and the norm in the ER's I'm acquainted with. If you are not dehydrated and able to drink with stable vital signs, you may rather be treated with zofran (ondansetron) for nausea and no IV, however.

Depends...: It all depends on how dehydrated they estimated you were. If they thought that you could go by with oral fluids only most likely they understood that the best treatment option was just that. If you persist vomiting and not tolerating even small sips of liquid might be time to go back for reevaluation. For now try very small sips of fluid and maybe dry crackers to help your stomach feel better.