i have never asked, and never been told.
I have been told by some peoples that sometimes the baby can be more engaged, and then the next week, be less engaged, so i take it that my obs figures its not a completly necessary thing.
he does U/s every visit, and fundal measurement etc. And from that, he tells me that the baby is positioned perfectly, says i couldnt ask for anything better. And, i am happy with that.