Laying the blame for pregnancy on either party, when you have no idea as to what really happened, is bad thinking!
I should explain that
I got my first wife pregnant, before marriage, when she was just 17 years old!
I have never blamed anyone else but myself.
Well I was 24 at the time!!

On the plus side - we had 20 years of marriage, and 2 beautiful daughters!

But please don't make comments about such things, unless you know the whole story!
The poor girl may have been raped, for all you know!