IM FREAKING OUT

Okay. Sooooo I need help guys. My period is "late" . It was supposed to start the 8th. Sometimes it's early like last month (it normally starts by the 10th) and SOMETIMESSS it's late, but that doesn't happen often. I get that it's two days, but I have regular sex and I'm freaking out. My boyfriend said to stop stressing. He says that he has a "gut feeling" that it will start. In the back of my mind I'm telling myself it's fine because it sometimes does start late, but I'm also still worrying. When I went to Google to see why my period may be late, it said a period isn't even considered late until after 5 days have gone by since it was supposed to start. What do I do?? Do I wait it out and stop stressing for now? Do I try to take a test even though it's early? I'm so conflicted like please help