Eandko, I know exactly what you mean. I only got a positive two days ago, and today is technically the day I should get AF, but my temps are still up and the test I took this morning was darker. We've been trying for over a year and a half and it just doesn't seem real. I also have a number of friends who have had miscarriages, which makes me nervous/scared as well. Like it's too good to be true, or something. I feel like the weeks until my first midwife appointment are going to drag by.
I just keep reminding myself that if it's going to happen, it will happen, and if it's not meant to be then it won't. That may seem silly but it helps me not to obsess as much. I'm trying to eat healthy and start exercising more, and just praying that I'll feel peaceful and this will be a healthy pregnancy!