Is my hair loss shampoo harmful for my pregnant wife?

I am currently using shampoo containing DHT blockers to improve condition for my thinning hair. I've heard that DHT blocker substances like ketoconazole, saw palmetto, can be dangerous for pregnant women. Can this be harmful for my pregnant wife, if she touches my wet hair or when we share a pillow during bed time? Should I refrain from using DHT blocking shampoos during my wife's pregnancy? Many thanks in advance!

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