Well, you may have not ovulated and usually no ovulation means no period. It's commone and will happen to most women at least once during their reproductive years. Also, just because it hasn't happended before doesn't mean it can't/won't.
That being said, if you miss a second period and are still getting negative test results, see your doctor for either a blood test or ultrasound.View Thread
Being irregular is common after going off the pill but if your periods have been regular since going off the pill, it might be time to go back to the doctor. If you aren't pregnant, they can give you something to jump start your period.View Thread
Anytime you have unprotected sex, pregnancy is a possibility. You can either wait until it's time for your next period and take a test or wait two weeks after the unprotected sex and test. Remember that Plan B can make your period late as well.View Thread
If you did not read the test within the time frame specified on the instructions, the results are invalid. You took the tests too early. Even the most sensitive test isn't accurate until at least 5 days before your expected period. Your period isn't due for over a week so it's too early to take a test. I'd wait and see if your period comes before taking another test.View Thread