My vote is - quit having unprotected sex unless you like the idea of being a parent.
Taking Levonelle does not constitute being on birth control. You and your partner BOTH need to use birth control. Don't just rely on taking the morning-after pill and think that you aren't doing harm to your body.
Take a pregnancy test. Then get your behind to your OB-GYN to talk about birth control methods and then follow through. In addition, your partner needs to be using condoms, as no birth control is 100% effective all the time.