Well, don't get too comfortable yet, folks, the OP has specified it's between Christmas and New Year (I highlighted it above), so Mary is
not becoming Queen.
A child born on October 12th, which Edward was,
could be conceived in December. 40 weeks from October 12 is January 5th, however, according to
https://www.whattoexpect.com/ - "
Only 1 in 20 babies are born on their actual due date. A normal pregnancy often lasts from 38 to 42 weeks, which keeps the majority of parents guessing right up until delivery day." - so Jane
could realistically be pregnant when Henry kicks the bucket. (42 weeks pre October 12th is Wednesday, December 22, 2021 (Source:
https://calculat.io/en/date/count/42--weeks--before--12-october-2022) which is actually
BEFORE Christmas, so is
not butterflied away by Henry's accident.
That could open a whole can of worms then - initially, everyone flocks to Mary... then Jane's belly begins to grow and she's been in mourning for Henry, so she hasn't been... aheming... anyone else, so it's clear it's Henry's child.
Cue interregnum while Jane remains pregnant. The child, regardless of gender, is Henry's only legitimate child, so would succeed. If it's Edward, cue
fifteen years of Protestantism definitively ingrained into England.
So, even if Henry dies in December, there's no guarantee Mary
will be Queen. Jane could, realistically, be expecting when Henry dies. She just doesn't
know it yet.
So that could put the kibosh on any plans above.