If you look on your notes, it should say 'palp' or palpable next to the numbers. At my 36 week appointment, babies head was 4/5th palpable which meant 4/5 could be felt outside of my pelvis still. At my 38 week appointment last week, baby was 4/5 engaged which meant he or she has moved right down and only 1/5 could still be felt above my pelvis. It is a bit confusing and different midwives use it in different ways, Best thing to look for is the palp or eng note next to the numbers xxx