Despite what your boyfriend may have told you, the pull-out method is not a good form of birth control. It is also not effective in preventing STD transition. There are different theories on whether or not pre-ejaculatory fluid contains sperm or not, but it's better to be safe than sorry. If you are having unprotected sex, STOP, and use a condom along with an additional form of birth control such as the pill or Depo. See your doctor or go to Planned Parenthood to start your method. If you are pregnant you can not get your period, but if you don't get on birth control you might not be so lucky next time.