Pregnant?

So I was supposed to get my period Monday April 2... so I’m 7 days late. It usually comes pretty regularly, never this late. My husband and I haven’t exactly been trying for a baby, but we haven’t exactly been preventing it (pull out and full unprotected). Over the past 4 or so days I have had very bad heartburn (Which I never get) and have been randomly nauseous not bad but noticeable. I don’t know if these symptoms are because I’m anxious (tend to suffer from anxiety) or early pregnancy symptoms. I took 2 tests this morning both negative. Am I testing too early? Should I wait a few days - maybe a week - before testing again? Should I just go to the doctor? I just want to know what is going on with my body! Please help ease my anxiety with some advice on what to do. Does it sound like I am pregnant?