Signs baby will be early?

I’m 31 weeks now. I had a 3D ultrasound at 28 weeks and my baby measured 12 days ahead. I sort of feel like she’s already dropped really low. Does this sound like she might come early? Is it too early to tell? I have this gut feeling she’s going to come earlier than we expect so I’ve already packed our hospital bags almost completely lol. I’m hoping she stays in at least for another month. I’m not due until October 29th.

Moms, if your baby was early, were there any signs you had leading up to labor (other than your water breaking/contractions)? Thanks!