Breast changes negative test

Hi I have noticed some changes in my right breast. The veins are more prominent. This could have been there before and I've just started to notice. I've read where it can be breast cancer and I'm terrified. I have also read it can be an early sign of pregnancy. My husband and I have been active and trying to conceive. Has anyone experienced this before? I took a test and I'm 6 days early but it came back negative. I just can't seem to shake the feeling something serious is wrong and call me nuts but I'm terrified to find out if this is cancer. I just don't know what to think or do at this moment. My husband can't seem to relate and tells me I worry too much. Which I do but I need insight please. Is having large breast and seeing veins normal??