How will we know for sure when our pug is pregnant?

QUESTION: How will we know for sure when our pug is pregnant? Ok… We have two pugs a male names Wilbur and a female named Charlotte. We have been wanting puppies for a while now… Well she has finally gone into heat Wilbur has been humping her… Well this morning he was finally ‘successful’ they got well you know stuck together…. well how do we know for sure when Charlotte is pregnant? And how long will it be until we can tell she is pregnant?Thanxlolzwe are not back yard breeders.

ANSWER:  Gee you want puppies but know nothing about pregnancy? God help you when the female goes into distress and needs a c-section like most pugs need.  Take her in and get her spayed.  The vet will tell you if she was pregnant. Seriously the world doesn’t need more backyard breeders.  Why are you above the AKC responsible breeding guidelines and the Pug Club code of ethics??