I haven't had a period since October and I have taken 5 home pregnancy tests. They have all shown negative. I went to my local health dept and had a test done there and it was also negative. The nurse practitioner told me to make an appt with my doctor but I won't be able to see them until the end of this month. I am having pregnancy symptoms and feel like I did in my first 2 pregnancies. Why do I continue to have negative pregnancy tests?