Period is 16 days late

**I’m not TTC at all I’m a college student** but my period is 16 days late and I took over 5 tests & they’re all negative. I’m on the pill and I occasionally skip periods on purpose, but I didn’t last month and I never got my period! Could I be pregnant even though the tests are negative, or am I just freaking out?? Even though the tests are negative I still don’t like the fact I never got my period because it makes me worry 😂😂 Someone give advice