will there be pregnancy?
Regardless of the day counter, the current plot has the girls at the school for only a year, and perhaps not even a 12-month term, but a typical school year, before exams. So the only pregnancy that would be likely to even show would be if Sarah or Rosie show up on campus in that condition. Honestly, I'd love to see them both show up, but I don't think it is very likely, pregnant or otherwise.