Wonderful news Phryn! Really really wishing for a super sticky bean for you this time, keep us updated 
If you think that 12+something is your thirteenth week so when you're thirteen weeks you're actually onto your 14th that makes sense, I think BananaToast otherwise I probably would have agreed with you!
That's pants daholster, if they think anything of you they will extend it though, maybe?!? Glad you're already seeing silver linings!
I was lucky and got 6 months full pay too BrixtonBunny and then took my accrued leave with ds1 so was back to work when he 6 1/2months, couldn't afford to live off smp. I hated leaving him 5 days a week 7.30-5.30 so I started childminding, totally different and blimmin tough to start with but 6 years later I'm so glad I did it. There's still guilt, they have to share me and their home, I can't do all the things I want as I have a gaggle of children to drag with me but it's better than the alternative imo.
This time around I will do the same as ds2, 3 weeks off and then back to it! I can't afford to live off smp and if I take months off I'd loose ally customers too. It was tough and I'm older this time so I'm hoping for a better sleeper than ds2! I will get 5 weeks smp including the kit days. I won't have to leave the baby but at the moment I'm working 6.45-7 3 days a week and 8-7 2 days a week so won't be easy. Still hoping for that lottery win!!