5 days late

I'm new to a lot of things. Keeping up with my period is one. Being sexually active is another. The last few periods have been a day or two late or early, but this time I'm almost a week late. There was a few times the condom slipped with my boyfriend, but I took two pregnancy tests and they came back negative. Tell me I'm freaking out over nothing? I don't even feel my period coming on, usually I can a week before.