When do you call your obgyn about late period?

When do you call your obgyn about a late period but NOT pregnant? This is my first time being late and it’s freaking me out 😂😅 I’ve been super crampy off and on like I’m going to get my period but I don’t.. I’m going on a week now that it’s late. I’ve tested pretty much everyday leading up and it’s negative. I was super stressed last week can stress really throw it off this much?

I know I’m dramatic lol but it’s never happened.