Can stress cause stomach and breast pain?

My husband and I are preparing to move out of state so I can pursue medicine. (Ironic) He will be without a job and he's the primary income. On top of this my family is putting a lot of pressure on us about the move. I have been experiencing lower stomach pain and breast pain only on the sides for the past two weeks. I have taken a pregnancy test and it was negative. My symptoms started before my last period which was normal and my next period is expected 7/9. I haven't experienced any other pregnancy related symptoms but the idea that I may be prego is adding that much more stress to my days! I'm thinking it is stress but I'm not sure if stress can cause both symptoms simultaneously