One week late and cramping ?

Mariah

I’m one week late on my period and my ovulation cycle starts tomorrow. I took a test yesterday and today and both say negative. My husband and I are laying on the couch and all of a sudden I get cramping. Not severe but to the point where I had to say owe and put my hand on my stomach. I’m not sure what this is or why I’m a week late but the test say negative. If someone could help me out that would be amazing