
Again, assume she could be pregnant and let her pregnancy run it's course. If, by around 2 days beyond 62 from the first mating, nothing has happened, unless she's in distress before then of course, you could take her in for x-ray to confirm whether she is empty. And again you should see puppies moving around by week 7, if she is pregnant.
You could also talk to your vet about all this!! As said although we have had the occasional false pregnancy, this hasn't kicked in until after the due date.
ps I never wormed my pregnant bitches. They were done, along with any boosters needed bringing up to date, BEFORE the mating. They were then wormed at the time I first wormed the puppies - usually by around week 2.