Boss thinks I flaked out.

🦄Sarah🦋
So I go to the ER last night after speaking with my boss at work. I was at work until 6 last night with bleeding and severe pain in my pelvic area. I'm currently 10 weeks pregnant with my first child. My boss pushed me to go to the ER to get checked out. All night I updated her with what was going on. Well after 6 hours, the doctor discharged me with strict bedrest for 48 hours and pelvic rest as well. I informed my boss and had someone to cover my shift this morning. Well the woman didn't show up to cover my shift and everyone thinks I just didn't come to work. Even though my boss KNEW I couldn't be there. What do I do?