In the movie Predator 2 (1990) there is a scene where detectives Cantrell and Lambert take the subway train. The Predator is on the roof of the train & scans train with his infra-red vision and sees who has guns
The Predator attacks & kills them all including detective Lambert.
When Cantrell is captured by the Predator outside the train the scan of her body reveals that she's pregnant.
At this time Cantrell has her gun but the Predator doesn't kill her.
Why didn't the Predator kill detective Cantrell even though she had a gun in her hand?