- well
- ill
- overwhelmed
- confident
- anything else
because every pregnancy is different, and every woman is different, and every family is different. You cannot safely assume anything about a pregnant woman. So her pregnancy can't help you reliably judge whether she can handle being CEO.
For that matter, you can't safely assume a woman is pregnant even if it seems obvious. I knew a woman with an abdominal tumor who kept getting asked when the baby was due.