“I live in the state of Wisconsin. Is my girlfriend legally obligated to tell me that she was pregnant or had an abortion just days ago? She told me after it was done.”
You would need to consult with a Wisconsin family law and/or adoption attorney. However, in most states, there is unfortunately no requirement for a woman to tell the father that she is pregnant. While paternal notification and consent is required for adoption, it is not required for any action or procedure prior to the birth of the child.