What causes late periods but negative pregnancy tests?

I’ll start here. I was supposed to start my period on June 14th. The period is usually on time or a day or two late. And last about six days. However, the period is eight days late. I have tested and came back negative. Maybe I ovulated late? Not sure. But the suspense is killing me. I haven’t missed a period before. Am I too early to test? Or should I wait a few more days? Has this happened to anyone else? Is it possible to ovulate late? Idk my husband and I are trying to conceive as well. So I’m hoping I am.