Sore breast?

I am very consistent with my periods. They come every month, same symptoms, sore breast, backaches,one massive pimple and mood swings. This month not so much I've gotten two pimples and no breast tenderness. As for my back and my mood swings not so much either. Could I possibly be pregnant? I have been trying my period is due in 2 days. And I don't really feel like it's coming At all? Ideas? Thanks ladies.