Prenatal vitamin makes me sick

Anyone else have issues with prenatal vitamins? I'm 7w, and I get very nauseated and have even gotten sick after taking them. I tried taking them in the evenings before bed, and woke up sick about an hour later. I tried the chewable gummy ones, I took just one and was having a really hard time keeping it down. Any suggestions? I called my doc and left a message on Tuesday and still no answer. I'm afraid to take them, and I feel horrible for not taking them. : (