Rainbow Babies Time Limit?

Hi all,

So my husband and I had an unexpected pregnancy a number of years ago. We found out late in the game that our little man had a genetic disorder that would result in still birth. Given the timing and lack of planning, we have not tried again. Now we are planning to start our family and I'm wondering if our first baby would be considered a rainbow baby or if that's only babies born closer to miscarriage/stillbirth. What are your thoughts?