High/posterior cervix but Dr. can feel baby's head

40 weeks on Saturday 
Good 1cm dilated, possibly 2, but cervix is very high still and posterior.
Dr said she could feel the baby's head. 
I'm a bit confused how can she feel the baby's head if I'm only 1cm and she could barely reach my cervix? 
I haven't lost any mucus plug either so I'm really confused., 

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