Im not really able to take prenatal vitamins what about flinstone?

im almost 8 weeks pregnant and i throw up a lot. i have prenatal vitamins but they just make me throw up worse. i hear that it is normal to not be able to take them early in the pregnancy and while i have bad morning sickness. i have tried taking them at all hours of the day. nothing works. sometimes i am able to eat gummy worms and keep them down. i don't know why but i do. i hear taking flinstone vitamins is a good substitute untill i get back on track. is this true??? if so is it ok that i get the gummy ones or do i have to get the chewable ones....blah.