Husband just started experimenting with magic mushrooms

Hey so I need some advice. My husband, whom is a an amazing guy and a big time nerd who’s never done drugs in his life, doesn’t even drink, just started experimenting with magic mushrooms because some girl he works with sold him some. He’s tried them 3 times now and says he loves them.

I don’t know how I feel about this, honestly I don’t like the fact that he is taking these let alone buying them off someone and having them inside our home.

We are expecting our first baby together in a few months which is another reason why I’m not into his recent choices. I mean now is a bad time to decide you want to start doing drugs. Like I said he’s never done anything. “Bad” in his life so why start now. Especially when you have a baby on the way. I’m not sure how to talk to him about this without sounding controlling. Am I over reacting?