Do you think my wife is pregnant?

Ok, we have been TTC for the 2nd month. This month we BD many many times around the ovulation. We tracked her ovulation by BBT chart. Also AF for her is like clockwork, never late. She started bleeding 5 days before her period, but that is normal for her...to spot until AF. Well this time, she stopped spotting 3 days before AF (which should have been today). Well, no AF today and an HPT has only the faintest of faint lines but you can see something for sure. I don't know if it is an evaporation line, but given the fact that she was due today and is dry as bone, do you think she really is prego?