Baby Congrats Saying How Can I Tell If My Baby Has Dropped?

How can I tell if my baby has dropped? - baby congrats saying

That bothers me, because anyone can tell me when my baby has just fallen and say oh baby fell congratulations to all the time ... but now this is my 4th Pregnancy and I still can not say as I said, I feel there is more pressure, and it is hard for me not to go because I'm already under the age of 21 weeks, so how can I say?