Unprotected sex with no ejaculation and used plan b within 2 hours. pregnancy test 14 days after sex. it was negative. is it likely to be accurate?

Yes: You were very thorough! these tests are very sensitive and the timing is correct, so there seems to be nothing else to do but practice responsible sex in the future. You seem to have done everything right to prevent a pregnancy except use contraception before the act. It would save a great deal of worry to have used birth control wouldn't it?