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Kelly Mom says:
"Milk supply during pregnancy
Most mothers who are nursing through pregnancy notice a decrease in milk supply by mid-pregnancy, but sometimes as early as the first month. During pregnancy, the mature milk is also making a gradual change to the colostrum which is present at birth. Supply may increase toward the end of pregnancy as colostrum production kicks in.
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and

"Many mothers who nurse through pregnancy have noted that their milk contains mostly colostrum during the last month before baby is born. You will continue to produce colostrum throughout the latter part of your pregnancy – your older nursling cannot “use it up.” "

Your supply turns into colostrum and will stick around for the first few days of new babies birth. If you choose to tandem nurse, your older child will help to encourage the milk to come in. Some toddlers might wean if your supply dips to low or if they don't like the taste of colostrum.