With DS I finished at 38 weeks. I was 35 weeks at half term and did 2 weeks after and remember wishing I'd finished at 36 instead.
And knowing that makes my Plan A even more mental.
The last day of term before Easter I'll be 40+1. The week before is 'science week', so not normal teaching, more supervising a load of other activities - I could be paired up with someone else and not do much at all. Seems daft not to come in for that - easy pay (and usually a fantastic week). Then it's a 4 day week before the holidays.
Realistically, I've run this plan past the assistant head and she's happy for me to have that as plan A and then alter as necessary closer to the time.
If I finish at the end of science week and then return for the last two weeks of term in July (we start the new timetable - but no yr7 or yr12 so lighter than normal) then that would coincide with maternity pay dropping to SMP (can't pay the bills on that).
This is seeming more mental as time goes on!