A bit of both for me. Both times.
It felt like AF was on her way. All the symptoms were there. But deep down inside I had a slight feeling that she wouldn't arrive. I dunno how to explain it. It's not like I said to everyone "Oh no I won't get it cause I'm pregnant" The feeling was so slight it was hardly noticable. It was just like this calm voice inside me telling me to not really expect her. Even though I had all the symptoms and was running to the loo tampon in hand every five minutes
By the time AF was 3 days late I had already set my mind on being pregnant. So the positive test results didn't really shock me.