Explain MMC please

👶🏼🎀

Can someone please explain to me what to expect with a missed miscarriage? I went to my first prenatal appt. I should have been 8 weeks but there was only a gestational sac. I was sent for blood work and I haven’t heard anything about the results. I am to return in two weeks for another scan and more blood work. We are praying there is a baby but I want to be prepared. What do I need to know? What are my options?