Is it ok to only use condoms during sex and not be on the birth control pill?


I am 20 and have been sexually active for about two years. I have used condoms and have not fallen pregnant. My sister keeps nagging me about it and telling me I should get on BC or I will end up pregnant. I know friends who are on BC and it caused them bad side affects. I do not want to hormonally alter my body so I use condoms instead. Is there any thing wrong with that?

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