The simple answer to your question is; Any time you have sex, a boys penis enters your vagina, you can become pregnant. It does not matter what you do before or after. IF you use a condom there is less of a chance and if you are on birth control the chances are even less.
The short answer is that anytime sexual inter course occurs there is a chance of pregnancy. Based on your writing I would say you are way to young to be having sex. If your boyfriend is saying anything like; "If you love me you will have sex with me." DO NOT HAVE SEX WITH HIM. HE does not love you, he lusts for you. There is a big difference between love and lust. [ adviceman49's advice column | Ask adviceman49 A Question ]
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