13 weeks and not feeling like its 2

Does anyone else have apprehension about their pregnancy? My last ultrasound and dr. appointment was at 10 weeks and babies were fine. But because I can't get the whole "anything can happen, you're not safer until after 12 weeks" and "vanishing twin syndrome can still happen between 10 and 12 weeks" I feel as tho I lost a baby, would I have bled? I think when I go to my dr appointment at 14 weeks and there are two I won't worry about it as much. But since I'm at the place where it can happen, I feel as tho it did happen.