"I'm pregnant"......"I'M PREGNANT!" what has that got to do with the immediate situation.
I am only guessing how i would respond....but...
I am 80 years old and i come home to find someone trying to open my safe. First thing is to deter them and secondly, perhaps more importantly, DISABLE them.......in simple terms, make sure that they can't hurt me.
A gun is clean and impersonal....the first shot shatters their collar bone, they turn and run, but are you sure that they wont retaliate?
No.....give them a second blast to make sure....the back, the spine.....anywhere.
Then...perhaps i would feel...safer.