Can you get pregnant on birth control ?

My sister has an IUD in she has the 5 year one she always heard you can't get pregnant on birth control. She was watching the show called I Didn't Know I Was Pregnant she said you can get pregnant no matter what. There was a girl on there who also has an IUD she watched the show the week before she was on... show more My sister has an IUD in she has the 5 year one she always heard you can't get pregnant on birth control. She was watching the show called I Didn't Know I Was Pregnant she said you can get pregnant no matter what. There was a girl on there who also has an IUD she watched the show the week before she was on there thinking it couldn't happen to her but it did. She said she and her boyfriend have been having sex shes really worried because now she's always hungry but that's normal for her. Is it possible for her to get pregnant ?
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