but it is NOT IMPOSSIBLE to happen, So Qhris, think again, if you find the story absurd, then read the newspapers and read those absurd stories of people doing the craziest thing you could imagined! So don't say that this is pure fictional, it could happen or maybe happening already in some parts of the world!

The point of the story is the way the Doctor convinced the woman that it's wrong to even think about what she'd thinking at that time!And that's the message of the story, NOT the part of having close-period pregnancy.