My period normally comes like clock work. My last period was October 20, 2011. I do have unprotected sex with my spouse almost on a daily basis. But i have yet to recieve my monthly period for November and its December the 4th now. I have took 3 home pregnancy test that has all three outcomes of negative. I sleep alot as well as eat. Is it possible for me to be pregnant? Do I need to have blood work done instead of pee?