In the end of The Terminator movie, Sarah Connor recorded audio tapes for her upcoming son saying: "If you don't send Kyle back in time, you can never be." (not exact words)
Yes, she was pregnant after sexual intercourse with Kyle, but how did she know that this offspring would be John Connor? There was possibility that pregnancy wouldn't result in successful birth, or her 2nd child would be future leader of human resistance against machines...
Was she mere a lucky fool or, by naming her first child "John Connor", she setting the future?