Question about the baby "dropping"?

how do you know when baby has dropped? what did it feel like to women that have experienced it and how much longer after baby drops are they born? been having pain on the very inside (all the way in)of my like the baby is pushing down on it. been having to pee way more but i am only 33 wks. is this too early for baby to drop? i havent started having to waddle yet but it feels harder to move around, roll over and such.. is baby dropping?