I have a pregnant pitbull I just recently brought how to make her nicer?

i brought another pitbull to breed with a male puppy i got in the future she is a year old but turns out she is pregnant news to everyone now she is aggressive toward the male puppy and scared him how do i introduce and make her like him she will watch him through the window fine and sniff him for a bit but after about a minute she will get angry and growl or if he gets close to the window she will growl if you correct her she stops but i don’t feel safe putting him near her he is only 12 weeks and she would easily kill him his name is bear and her name is rosie how do i properly introduce them cause i don’t wanna have to put her outside away from him cause now my family thinks she is aggressive other than me and my father who both know it is cause she is pregnant and he is a male how should we handle this

I have a pregnant pitbull I just recently brought how to make her nicer?
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