Not really. There is not much evidence on the safety of consuming fireweed leaves during pregnancy. It is best to stay on the safe side and avoid it’s consumption during pregnancy.

Is it too dangerous to paint the nursery myself when pregnant? Will the paint fumes harm my baby?
As per advice from NHS UK, “It’s highly unlikely that painting or being around paint fumes while you’re pregnant will harm your unborn baby, as the risk from most modern household paints is very low.