I would believe almost anything right now including a whoops baby. Only two things make me think this is not a pregnancy:

1) TS strikes me as a girl who has PLANS. Mistakes don't happen in Taylorworld, especially with legions of tweeny fans and their churchgoing moms to think about. Extramarital pregnancy combined with a very unfortunate cheaty overlap are so off the wall for someone who controls her image so fanatically. And even if she does vanish for a few months she will struggle to make the maths right. If she shows up with a full term baby in 6 months time nobody will remember the story of the whirlwind courtship we are currently being spun.

2) Call me a devotee of stereotype but 99.99% of men don't want to get their GF up the duff in the first few months of a relationship, no matter how infatuated they are and no matter how much they want kids in the abstract. They like to feel they are making a choice. The whoops baby dad looks a lot more hangdog than TH in these pics (exhibit A: step forward, Mr Cumberbatch).

I think we are possibly searching for a plausible explanation because this is so nuts compared to how TH claimed he was. If we throw everything he said about the ephemeral nature of fame and his privacy in the bin, and start as if we didn't know him, we would just say, TayTay is a hungry famewhore who uses every relationship for $$ more than the last, and she has totally found her match.