i took 3 at home pregnancy test that came up positive. a couple came up negative. i went to the doctor and did 3 blood tests and they were all negative. i have missed 2 periods and fixing to miss my 3rd one in about 2 weeks. when i took my first pregnancy test i was only a few days late. but now i am really late. could i still be pregnant? i have never missed any of my periods before. i have been late before, but just by a week at most. i am so confused.