good prenatal for paleo?

Hello group! I am new to fitnesspal but seem to be among friends. I was 258 when my first LO was born 2.5 years ago and we are thinking about trying again. I want to lose weight and am still at the same weight when Maddie was born. I know I should try to shave off a little more (we're hoping to be prego by August). I am working out 2-3 times/week. I am doing paleo lifestyle about 80% of the time but have totally said no to sugars and super starchy foods. The only real exception to my diet is corn - i love popcorn and homemade tortilla chips... Other than that, I am rocking away. Any advice on good prenatal vitamins? I took GNC's low-iron supplements before but am just shopping around now. I just need encouragement to continue to work at being healthy.