I'm very concerned.. having sore breast,tired,headaches I want to put in that when I was pregnant with my daughter I tool 5 pregnancy test and all negative I even had a period with her and I finally took the 6th test and it came up negative I was almost 2 months pregnant so I'm wondering what's going on her..

Go back to your doctor and ask about further testing, such as your thyroid. There are a number of possible reasons for the lack of periods. They will likely do an ultrasound as well, which would definitely show a pregnancy if you are pregnant.