Old habits die hard

Here are a few things that I know to be true:

1. I am not pregnant.
2. Given #1, I cannot currently be miscarrying.
3. If I were miscarrying the baby with which I'm not pregnant, it wouldn't be happening through my nose.

And yet, just now, when I blew my nose and saw a bit of blood, my heart started racing and my stomach dropped. I wonder if I'll ever fully lose those reactions.