Correlation between morning sickness and prenatal vitamins?

So, luckily I'm 5W3D and haven't experienced morning sickness yet (and I hope I won't ever!). I have been taking prenatal vitamins for over 9 months now (it's more than just folic acid - it's called PregVit Folic5 and has an AM and PM pill with a variety of different vitamins inside). I was wondering: does anyone know if there's a correlation between taking prenatal vitamins and prevalence of morning sickness symptoms? I see a lot of posts where women ask if it's normal not to feel any morning sickness. Have you ladies been taking your vitamins? What about other ladies who experience sickness? Have you been?