no period after taking plan b

I dont know who prescribed you the pill but they should have explained Plan B is a high dose of hormones and can cause your period to not show up on time. All though there is a small chance of pregnancy with any Birth Control, Id say its just oyur hormones out of wack

so then its just my system outa wack and i should believe the tests when they say negative

Has it been at least 14 days since you had unprotected sex? If so, then the tests are most likely accurate. Plan B helps prevent ovulation. The only way you would have gotten pregnant is if between the time the sperm entered your body and the time you took the pill, you ovulated and then the sperm fertilized the egg. The chances are low with plan b, but there is still a chance. However, if it's been at least two weeks and the tests are negative, chances are pretty high that its just the hormones putting your body out of whack. Also, if you already bled a week later, chances are very low of you being pregnant because typically a woman does not bleed while pregnant, or if she does, its light bleeding.