If you aren't already at the vets office, since it's Friday with the weekend almost here, I would get her checked to make sure she's pregnant. I remember thinking one was pregnant and could have sworn she had at least one maybe two...just to find out she was constipated.
Better safe than sorry. Mardelin is right. 67 days is the magic number. It's 58 days from ovulation or as long as 67 days from breeding. This really is one of the most nerve wracking parts of breeding. Especially with a first time bitch.