What should I do?

My husband has teenager kids from previous marriage. His 18 years old daughter live with us recently. She has told me all her secrets like about her boyfriends from past that she never told her parents. she now told me that she go out with a guy but hiding. She just tell his dad (my husband) that she is going out with her friend but ended going out with a guy. Should I tell my husband? Also she told me that she want a baby and told me that she told her guy. What do you suggest? If not then I would zip my mouth and not get involved? But what if this happen and if they asked me if I knew?!

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