Period is late but pregnancy tests are negative...

Kirsten

I am 2 days late on my period. Yesterday morning I took a test and it was negative. I'm confused my period is never late, I always have a 28 day cycle and I am now on day 30. With my son I was 2 days late and it was very positive so I'm guessing I'm not pregnant because it should be showing positive by now. Do you guys have any ideas? I'm lost 😟