Babur Karamat Raja from Sutton Coldfield is accused of attacking the 40-year-old in Sutton Coldfield on Friday.
The British man's origin is unknown and is likely to be revealed during his trial.
He has also been charged with assault, attempt child destruction and possession of a knife.
Raja is due to appear before Birmingham magistrates tomorrow.
Police said the woman is in a stable condition in hospital and her baby girl - born following the alleged attack - continues to do well.
In a statement released by police, they said: "We'd all like to express our heartfelt thanks to everybody who helped her on Friday afternoon.
"Your fearlessness and selfless actions saved both their lives and we are overwhelmingly grateful to you all.
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