Actually, they same the same thing, just that the emphasis with the
NHS link is to scare you into using contraception.
The first line of the NHS link states: “Yes, although the risk of getting pregnant in this way is VERY LOW. If you want to avoid getting pregnant, you should use contraception.”
While I stated, “It would be extremely rare and difficult for a woman to get pregnant without having her partner ejaculate deep inside the vagina.