My period is 14 days late. i've taken several dollar tree pregnancy tests, they were all negative. could it be false negative?

Possibly.: If you did not follow the instructions, or if the tests are expired, the result can be a false negative. If that does not apply to you, see your doc for a blood test for pregnancy. See http://www.pregnancycorner.com/pregnant/pregnancy-test/false-negative.html

See doc or check 1w: Over the counter home pregnancy tests take longer to turn positive than blood tests do, but usually 2 weeks is enough, unless the period would have been a bit late anyway. Options for a suspected pregnancy but a negative home pregnancy test include: See doctor for a blood test, or repeat a home pregnancy test in 1 week.