Home pregnancy test results are not infulenced by birth control pills.
Home pregnancy tests measure the presence of a hormone called human chorionic gonadotropin (hCG) in your urine. HCG, which is produced in the placenta shortly after the embryo implants into the uterine lining, builds up rapidly in your body in the first few days of pregnancy.
Birth Control Pills do not contain hCG, and hence can not impact the test result.
Also, HPTs aren't influenced by alcohol or over the counter medications.
For more on Home Pregnancy Tests, check out
WebMD: Topic Overview: Home Pregnancy Tests
I'd recommend that you get two pregnancy tests now: take one immediately, and if it comes back negative, but you still don't get your period in a week, take the second one then.
Because you had unprotected sex, no matter what the result of the pregnancy tests, you should also get a full STD screen.
Hope this answers your question.
Spike: (In response to being asked to fight a troll) "I would, but I'm paralyzed with not caring very much."
[This message has been edited by Alaska (edited 02-05-2003).]