Breastfeeding while pregnant

Trisha
I'm still nursing my 16 month old pretty regularly- he seems to need it, and I'm still loving the closeness. I'm 6w3d pregnant and having constant nausea, making it impossible to eat. I'm worried about my supply dropping- is it safe to take nursing supplements (like Mothers Milk Tea) when pregnant? Any advice on nursing a toddler when pregnant? Also, I'm considering tandem nursing if all goes well- does anyone have any experience with that?