Doctor said fetus will typically pass in missed miscarriage. have you heard of a case where it did not pass naturally?

Of course: The likelihood of a miscarriage completing naturally is high in the first 8 weeks or so of pregnancy, and much less good between 8 and 14 weeks. Needing a D&C is very common at this stage. After 14 weeks the story again varies. If this doesn't sound familiar I recommend talking again with your doctor; you can also resubmit here on Health Tap with more specifics. Good wishes, hope this helps.