Pregnancy vs period symptoms?

Okay so I know there are similarities between symptoms! My period is a week late as of today, and I plan on taking a test within the next couple of days if I do not get it. I have not been nauseous or spotting at all, but I do have tender breasts and back pain like my period should be coming.That's what normally happens to me beforehand but it has still not arrived. There have been moments where I literally think I got it, but when I check there's nothing there! I have not experienced any other symptoms, but I'm starting to feel nervous. This past month has been kind of stressful and I have not been sleeping very much or well, not sure how that could play a role. I was also sick with a virus and got a cold after. Comments?