Mystery Pregnancy
The doctor was taken aback at her question, he gave her a confused look and since her expression didn't change, his suspicion was confirmed.
This was really one mysterious couple, maybe they are not part of this world, or have mental problems,else, why would a full grown woman be asking him such stupid question. Doesn't she have knowledge of atleast the basic biology?
How the hell, was he supposed to answer that 'oh madam, that strange young man that just left here, inserted his penis into your vagina and in the process his semen was released and you became pregnant' such dumb question from a dumb woman.