Am I wrong for threatening to divorce my wife because she refuses to give up alcohol while pregnant?

It's a short story, my wife, age 28 told me she stopped drinking months ago. I'm 37. She's 3 months along. She came home last night from work sloppy drunk. I'm scared she's doing this on purpose to kill our unborn child. I told her that if she didn't stop drinking I would file for divorce.
Am I wrong for threatening to divorce my wife because she refuses to give up alcohol while pregnant?
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