My iron tabketsy were making me ill, I found something in the UK called Spatone iron water I take it with some juice and I cant taste it, I highly recommend!
Yup they r right the baby will take what it needs from u so. Like calcium it will take it from ur bones n if u don't replace what the baby is taking u will be more prone to getting osteoporosis. Same with iron. If u don't take them u mine lose too much n be deficit n u may need a blood transfusion after delivery. So it is very important to take them even if they make u sick. Take them with a meal. Sometimes it's the iron that makes u sick so u need food with them.
If you plan on breast feeding I'd start taking them. The baby is taking your vitamins stores and the vitamins are to replenish them.
As long as you are eating a healthy, balanced diet your baby will be fine.
Baby will get what the baby needs. The vitamins are more for replenishing what you will be losing.