I think my baby has dropped

Jessica • Baby girl born 11/2/17

I'm 30 weeks and 2 days.

I'm due Halloween. My next appointment isn't until the 31st. Where I will also have a growth scan because my doctor feels my baby is measuring smaller than she should be. Last appointment though My baby was completely healthy.

Today I noticed as I've been taking pictures the last week and half that my tummy looks as if it's dropped. Is it possible to drop this early? FTM! and if so what can this possibly mean? And if my baby is measuring smaller than it should, could she possibly come earlier than expected?

Not sure what to expect at the moment. And the 31st feels far away.