Hi i am jatinder, i missed my periods on10/1/14, my last period date was 14/12/13. i had done pregnancy test its on 12th jan its +ve bt 1line is light?

Don’t guess.: Take a test.  they are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period.  if you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.

You are pregnant: A test as you describe it is a positive test. I would advise getting to the ob's office soon.