Prenatal vitamins

So I'm 10 weeks and 3 days.. I started taking the vitamins at about 5 weeks but only lasted 2 and a half weeks. After that, I was sick to the point where I would be in bed all day and having what my doctor thought was a mild allergic reaction. He said it wasn't too concerning though and just try for a bit longer but I couldn't. I've now been off them for about 3 weeks and of course my doctors been on vacation for a bit so I can't ask him.. Does anyone have any advice on what to do if I can't take them? I know my baby and I both need the nutrients from the vitamins but is there anything else I could take or even a certain diet?
 I just want my baby to stay healthy but there's no way I can take the vitamins again.