Help! think my scottie dog is pregnant!... :)?

hi iv got a 1 year old scottie dog nearly turning 2 and she was in heat nearly 2 or 2 and a half weeks a go i think its about 2 weeks ago just about and i think she could possibly be preg?? her mood has changed slightly not like mood swings like we humans get but for example shes not been walking dow and up the stairs as often but trys but as if she resists it and even when on the couch she wont jump down all of a sudden, her tummy seems more bloated than normal i would say and my mom says her nipples have gotten slightly harder and reddish? well yeah and i don't no if some body could please please give me pointers that she could be preg that would be a huge help and in a month if thoughs pointers still come threw il go see a vet.. thankyou..! :)