Yes, it does seem scary. I'm so sorry you have to go through it. Are there threads on here where other people say what it was like?
My mum lost a baby at 20 weeks, although it died at 16 weeks, when i was 8. They didn't tell her there was no heartbeat at 16 weeks, she found out a few days before she lost it by going to drs about some cramps/bleeding/something. She passed it at home. She said she woke up in night with period like cramps, went to bathroom and passed it. I only found out all the details a few weeks ago (although I remember her going to hospital at the time).
There's nothing I can say to make this bit any less awful. You just have to try to focus on your holiday afterwards & then trying again. You will get through it.
Hope your classes have taken our mind off it, even if its just for a few seconds.
xxx