I took Plan B about 2 months ago after having unprotected sex with my boyfriend. I know one of the side effects could be that my period is late, but my period isn’t very consistent…

Between then and now I’ve taken 2 pregnancy tests and they have both been negative, but I haven’t had my period yet. Can I be pregnant?

Taking an emergency contraceptive, like Plan B, can change your regular bleeding pattern. The Plan B pill is a dose of progesterone, a natural hormone that builds up the lining of the uterus. The medication is actually tricking your body into thinking it should have a period. You should have some sort of bleeding within three weeks of taking the Plan B pill. If you do not have any bleeding or spotting (minimal bleeding) within three weeks, you’ll want to take a pregnancy test. It’s important to wait two to three weeks after the unprotected intercourse occurs before taking a pregnancy test; you will not get an accurate result until this time. If you waited two to three weeks after the unprotected sex to take your most recent pregnancy tests, and did not have any other instances of unprotected sex, you should take comfort in the negative results. Otherwise, take another test.

A person’s period can actually fluctuate based on what’s going on in their life.  This means that stress, sickness, change in physical activity, or even worrying about being pregnant can make a period come late. However, the only way to know for sure is to take a pregnancy test. These can be purchased at a local pharmacy or grocery store for just a few dollars. Both Longmont and Boulder Teen Clinics also offer low-cost pregnancy tests

Definitely speak to a health care provider if you have concerns about pregnancy and/or irregular periods. EC does not protect against STI transmission so be sure that you and your partner get tested to ensure you both are STI free.

You can find more information about your period, Plan B and other birth control methods on our website.  Make an appointment at Teen Clinic for a personalized consult.