39+6 here and patiently awaiting the birth of no2.
My DD was born at 39+4 but I could feel labour starting at 39+2 really.
Everyone assured me the second baby will be earlier than the first (and also an easier labour but that's another issue!!) And I've now spent a week mentally preparing myself for labour to start. Each morning i wake up with absolutely no symptoms! I'm in disbelief that I am going to make it to 40 weeks 
I know every pregnancy is different but just looking for other mum's who've had later second babies. When did you eventually go into labour?!