Vegeta had decided on his path before He-El: first, he would go to Earth and train until he became powerful enough to defeat Goku, Piccolo, Tien Shinhan, and Yamcha. Then he would head into the universe and become a Cosmic Emperor like Frieza.
He-El did not stop him. Vegeta was secretly delighted, and he respected He-El even more.
He-El could not be bothered to remind Vegeta that Frieza had a father and an older brother, both stronger than Frieza himself.
Once Vegeta surpassed Goku, Piccolo, Tien Shinhan, Yamcha, and Krillin, taking on Frieza's family would not be a problem. He could become whatever kind of Cosmic Emperor he wanted.
Let Vegeta work hard with his goal in mind.
He-El watched impassively as the secretly delighted Vegeta left.
Then, after ten days aboard He-El and Bulma's Spaceship, when they were nearly back to Earth.
That morning, after Bulma woke up, washed up, and prepared breakfast, she went to call He-El for breakfast. He-El took one look at her.
"You're pregnant!" He-El looked at Bulma's stomach and sensed the aura of life beginning to form within it.
When he had first met Bulma while searching for the Dragon Balls, she had been sixteen. A year later, they participated in the World Martial Arts Tournament and won the championship, when Bulma was seventeen. Three years after that, Bulma hid aboard the spaceship and followed He-El to Planet Namek. They then spent several years traveling through the universe until Goku and the others arrived.
By any count, Bulma was already twenty-six or twenty-seven. She was not that young anymore.
He-El and Bulma had never taken any precautions. They had simply let nature take its course.
Now that he sensed Bulma was pregnant, it was not surprising at all.
"Ah? I'm going to be a