On the topic off assured mama's who need a cervical check...
With DD1 i didn't want one but my mw sort of insisted. I lay down resentfully but since DD1's head was crowned (i had no idea what was going on, active stage was written up as 1hr24mins which was their arrival to that VE, and honestly i just felt pressure and discomfort and believed them that i wasn't in "real" labour yet) there was no V to E.
With DD2 i tried to feel myself right after my waters broke, but all i could feel was impossibly wide anterior vaginal wall and nothing else (i was hoping for top-of-head!). My mw was behind me (i was on all fours) and asked me what i felt, i told her and asked her to feel. I NEEDED to know, i just felt it. It had gone from a very distant irrelevant detail to the only fact in the world which mattered in a few moments. She did a VE (James Herriot style as she put it! :D) and told me i was fully, the head was at spines, and i could push whenever i wanted to.
I pushed HARD, through the next contraction, and the gap (the urge never stopped, and i could feel the baby's feel stepping and bracing against the fundus inside), and the next contraction and then i panted (on autopilot, i wasn't told to and didn't think to, i just noticed i was) for a few seconds before giving another huge shoving push. DD was born with a true knot in her cord. I believe she asked me to have the VE because she wanted me to be able to push without reserve until she was born. She was tachy in the only doppler listening the MW managed (labour was 55mins, plus 6 of pushing, mw was there for the last 30 or so mins and i simply couldn't keep still for her to listen but once - she was concerned but it was 7mins before the baby was born, right after the VE, and she could tell by the look of me that it was too late to think of transfer or anything) and i think she knew descent was going to be either very fast or very dangerous for her. She took her first breath and began to scream when her (anterior!) shoulders were still inside me, her apgars were 10 and 10. She screamed breathlessly until she was 20mins old, the placenta came and we cut the cord. The second the knot was cut away she fell silent, looked at me for a moment, then began to nurse.
Maybe the motherbabe you were helping needed you to know about the previa, nothing went badly, you did a great job, but maybe they just needed you to be prepared, just in case?