I have had one period since getting of birth control pills. My period is now late (last period started April 6th or 7th). Over the last two weeks I have experienced multiple symptoms including, nausea and vomiting, frequent urination, very vivid dreams, cold-like symptoms, lower back pain, excessive tiredness, and headaches. I took two blue dye pregnancy tests last night and both had a very faint line. This morning I took a couple tests and they were clearly negative. My husband and I did have unprotected sex multiple times. Is it possible to experience these symptoms so early? Could I be pregnant, and if yes, why the negative tests?