As the vaccine data rolled in, this would be something for data surveillance to watch out for. At that early date, it’s important to emphasize, scientists knew very little about possible COVID-shot side effects for pregnant women. This was for a simple reason: Pregnant women had been excluded, as is extremely common, from the earliest safety tests. An Iranian assassination threat had led them to believe Air Force One could be targeted with a missile en route back home. That made Air Force One a “decoy” with media and some White House staff aboard, the official said.