I had one VE upon arriving at hospital (planned HB, transfer for meconium). My doula and midwife had not yet arrived and although I didn't want one I agreed. 6cm after an hour labour. After that, I had no further intervention bar a Doppler check every now and then. I too transitioned on the toilet, my show came away and my pitch rose which was a telltale sign. I have no idea when I was at 10, just that when my body started to surge I felt the change and let it happen.