Why is imarti so surprised

In precap they show that doctor tells anuj and family that ambi is pregnants.  Imarti is stunned.  I can understand her being horrified because it will be harder to find a way to throw ambi out but why is she surprised , does she think her son anuj is impotent.😆

I feel bad for ambi only anuj is happy about the news, rest are horrified.  Sucks for a first time mother.  

But then I guess anuj is all that matters.