My period is late by a week, I have nausea, dizziness, fatigue, abdominal pains every now and then, I urinate more and I am moody, but I have taken 4 tests, one tonight, and all say negative. I have untreated hypothyroidism, but last time I miscarried they said my levels and my organs are fine, I should be able to carry a baby just fine. So why would I get a negative test?