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Please take medical advice from the World Wide Web (WWW) with caution, especially advice from sites like this one where people with no medical knowledge may edit. Some of the advice will be excellent, but other items will be wrong and following that advice without checking can be dangerous. Consider the source.
Yes, it is possible for a woman to get pregnant as long as she is old enough to have a period. (A young woman who has not yet had her first period can still get pregnant.) It is also possible to catch a sexually transmitted disease so if you are going to have sex, you should use protection.