baby's head is extremely low

Hey y'all 
I went to my dr yesterday and was told I was 2cm dilated and 50% effaced.  I'm currently 38+2this is my third baby and final 😁😁but since she checked I have been having random contractions lots of mucus and tons of pressure. Well recently I went pee and although they said yesterday my baby's head was very engaged ;I feel like when I peed I got a ton my pressure and I felt her move further down it feels like she will fall out or my water will break any advice ?