Neither sounds right to me. I'd use 'from'.
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CliveHi,The most common expression I hear is 'Her boyfriend got her pregnant'.Clive
AnonymousWhere I come from "get pregnant" is a stative verb. So we use to. For example, I got pregnant to my boyfriend and I got married to him a month later.Wow! I've lived one half of my life on each US coast, and I've never heard "I got pregnant to my boyfriend."
Where I come from "get pregnant" is a stative verb. So we use to. For example, I got pregnant to my boyfriend and I got married to him a month later.
An aside: people sometimes use "fall pregnant."
i.e. I fell pregnant to my boyfriend. = I got pregnant to my boyfriend.
And where do you come from, John?