Hi Helle

You should be fine, unless you have seen a dr and had blood work done to show a deficency, most supplements you take will be more than enough (you pee out most of it). Making sure you eat a varied and healthy diet is your best bet. Eat to hunger, drink to thirst.

I breastfed throughout pregnancy, and than tandem feed no worries.

A good source of info for this is the ABA booklet "Breastfeeding through pregnancy and Beyond", or see this link: Australian Breastfeeding Association - Breastfeeding Through Pregnancy and Beyond