Hi there! I'm worried too, since my symptoms have been very mild. I also had a failed pregnancy last summer, so this makes me extra nervous about this one. Try to be patient and not to read too much into it.
Re what to expect - it really depends on how far along you are on your scan. If you're over 6 weeks, you should expect to see something resembling a tiny blob with a heart beat. If you're around 8 weeks, a bigger blob with a much stronger heart beat. If you're around 12 weeks, then you should expect something closer resembling a real baby, definitely with a strong heart beat. These are the best case scenarios indicating a healthy, viable pregnancy. Good luck!