Late period/negative preg test

Maria

My period is a week and a day late and I'm usually never ever this late by this much. If I am, I then have a day or two of major cramps leading up. I've been having mild cramps for four days. I took a pregnancy test 4 days ago and it was negative. My boobs have gone up a cup it feels like. What's the deal! Stop messing with my emotions Mother Nature!!