1 | Yes it is quite possible to get false negative pregnancy test if you are using certain medications. Such medications could be certain antibiotics and most of the hormonal medications. ... Sometimes tests can give you false results because it is too early for the test. It is usual said that you can do them 7 days after unprotected sex but it is possible that two weeks after you get positive test. | Falling in Love Lasts an Instant | Your Spokane County Sheriff's Office consistently invests available resources toward community-wide safety and security | 849 | Here is the complete list of all of the zip codes in Orange County | 702 |