Doctor's appointment

Today I was scheduled to meet with my OB and right before I was leaving work they called to cancel and said he had an emergency. My heart drop and broke. I held my tears in but was unable to focus the rest of the day. I just knew today would take my anxiety away after having the ultrasound. I had a MC in November and nervous it'll happen again. Some days I feel pregnant and others I don't. They didn't even call me back to set up a reschedule date. ??