AF is super late and my tests are negative

Elizabeth • Student and former nanny and daycare attendant. Just making my way through the world learning and teaching
AF is 4 days late...I'm NEVER this late, 30 days like clockwork every cycle! I've taken 3 tests this week an early response EPT and a ClearBlue digital with weeks estimator and now a dollar store test and they're all negative. My boobs itch, are crazy hot, my nipples are tender, I've got a much larger appetite than in used to, insomnia, mild head aches, and nausea with some small bouts of vomiting.....What should I do? I really think that I could be pregnant and AF really isn't showing up but these HPTs keep coming up negative in feeling lost confused and!!!