I take a raw prenatal vitamin because it doesn't have the dyes in it. They're a little more expensive but I know the due isn't good for me or my baby. I've been taking them since long before I got pregnant!
Yes, you need to take them immediately. Gummy prenatals are fine in the first trimester, but later on you need more iron, which they don't provide. So, by the second trimester, you'll need to switch to something else. I took gummies in the first trimester because the iron made me sick, but switched to pills around 14-15 weeks when my stomach settled.
While trying to conceive is the best time.
I like the gummy prenatals. ..while I was pregnant, i took spring valley gummies found at walmart. So yummy. They had orange, strawberry and lemon flavors.
Prenatals are best before you even get pregnant do start ASAP! I like prenatals with iron and whole good based. Finding one that also supplies DHA is good. But any brand is acceptable so just find one that you like :)