There are so many more explanations than 'the worst', and I can't believe that your midwife told you that! Stress is not good for the baby, and she should be helping you keep positive.
I know that when I miscarried last time, I had 2 scans. The midwife who did the first scan knew that something was wrong, but she still told me that her machine wasn't that good, that my uterus was in a funny position, everything she could to keep me positive just in case baby was ok! There's no point getting you all worried about it, and then telling you that you can't have a scan until tomorrow!
Of course, you and your baby are in my thoughts and prayers. Praying that tomorrow you can see LO- alive and well.
Lots of love,
Cat
xxx