Could I be pregnant?

Brittany • I`m married to my wonderful husband (9/23/13)! We have a wonderful little girl:) We are Christians:)
Ok I'm suppose to start on the 15th. I was nauseas last night but today it's like an overload. I just smelt something out of the blue at work that smelt like dog food & ing it was horrible..the sides of my breasts are a little tender too. I bought a couple cheap tests last night but wanted to wait a little closer to the 15th take. Help!