I watched OBEM a lot before pregnancy anyway, but have asked DH to watch it a few times, as I think he was under an illusion that birth was 'clean' (not a lot of blood, etc). I'm now half way through pregnancy.
I've watched it recently, two people had big bleeds that meant lots of doctors running around tending to Mum, and now I've seen one where baby isn't breathing properly on its own and has been rushed away to neo natal.
I'm aware these things do, very sadly, happen. But should they not put some sort of warnings on there as a heads up?! I don't care about the normal blood/poo/whatever in birth scenes, but I'm never prepared for the emotional stuff.
I keep saying I'm going to stop watching it whilst pregnant but it never happens.