I'm really sorry, I shouldn't be even replying as I'm not sure but didn't want to say nothing at all.
I'd call the hospital to be on the safe side, Your baby is well and truely ready to come 'out' (40w+3D) So could very possibly be time. I never saw my show with my 1st, So not sure. I always thought brown blood was old blood. I'm sure the hosp would be happy to take your call, possibly even ask you to come in!?? Good luck, hope all goes well!