Got check today, have a question

Jenna • We had our first baby girl September 21 2015 👑 she's our world! Now we're expecting baby number 2 in Sep!!
The doctor said he could feel baby's head and that she's low. He said he was trying to go around it to feel my cervix and said its still closed. 
I guess looking at diagrams if he felt babies head that means she's already down in my vagina area? And how would my cervix still be closed if that's true?