My last period was September 10-13 and I haven't received a period for October and today (Nov. 1st) I went to the doctor and I got a negative pregnancy test . I been having a few pregnancy symptoms mainly headaches, fatigue and back pain. What do you think is going on?

It looks like the timing is right for pregnancy. One whole month. The negative test could mean the pregnancy hormones haven't kicked In yet, and showed negative. Do another HPT with urine, first of the morning, or have a blood test done

Agree, it is possible, but those signs can also be other things also. Was the test at the doctor a blood test or urine test