Start with sketching the basic shape of the pregnant woman's body. Focus on the enlarged belly and the posture that shows her pregnancy. Add details like facial expressions and clothing later.
A pregnant cartoon woman vector usually shows a woman with a rounded belly, often with a gentle and nurturing expression. The clothing might be loose and comfortable to accommodate the pregnancy.
Well, start with the basic shape of the body. Sketch an oval for the head and a larger oval for the belly. Then add simple lines for the limbs and details like hair and clothing.
Depicting pregnant cartoon girls can raise ethical concerns as it might normalize or trivialize complex issues related to pregnancy for a young audience.
Often, in cartoons, the scene might show the pregnant woman in some discomfort, surrounded by supportive characters, and then the baby being delivered with a touch of magic or humor. It depends on the style and tone of the cartoon.
I don't think there is such a cartoon. The story of Black Cat being pregnant with Spider-Man is not a common theme in the regular cartoon universe. You might have to search in more obscure or specialized comic or cartoon sources.