Could I be Pregnant

I am 18 years old. I am currently 12 days late, which is abnormal for me. I took a cvs brand pregnancy test which came up negative, then the next morning I took another (since it is recommended) and there was a slight line in the positive circle of the test. I took a clear blue test during the day the next day and it said "not pregnant". could I still be pregnant?

[AnnieBrooke]

Try taking all tests that you do take, in the morning with first-morning urine.  If you don't use concentrated urine, you won't get a reliable test result.