Prenatal vitamins ??

Hello. I've been TTC for almost a year and just recently started taking Materna prenatal vitamins. I've been taking them everyday with food. Two weeks ago, I got a really bad flu and stomach flu. (Puking every 20mins, freezing, massive headache, burning up and also pooing at the same time) This morning I got the exact same thing again. Could the vitamins be to strong for me and getting me sick? I'm going to the doctors tomorrow to see if anything is wrong? Any of you ladies experienced this?