Help! 7 days late! 3 negative pregnancy tests!

Hey ladies!

I dont post often but I'm kinda just starting to worry. So my period is late. I took the advice everyone I knew who had been through this told me. I waited 5 days and took a test. It was negative. I waiting a couple more days (up to today) and just took 2 more this morning to be absolutely sure. Both negative.

I of course fell into a google hole and we all know those always lead to basically google telling you you're going to die. This has happened to me once before about a year ago and I was fine but back then it was only maybe 4 or 5 days late. Never 7. In a couple more days I'll definitely be going to see my doctor again but I wanted some encouraging words and NICE opinions if anyone thinks they might know what's going on.

I did change my diet and exercise recently but the last time I did that I was only a couple days late and I'm usually otherwise a very regular girl. Work has also been stressing me out beyond any believable belief so I know that could be a cause too. Even when taking the test I didnt think I was pregnant. Most ladies will get what I mean when I say this but I just didnt "feel" pregnant. Like call it instinct but I just knew. But now I dont. And after 7 days I'm not starting to worry. Any insight will be helpful. And please keep any disrespectful or critisizing comments to ya damn self. Thank you in advance!

Update forgot to mention I stopped taking my daily vitamins recently too. Dont know if that means anything but figured I'd add it.