How do you tell??

How do you tell when your baby drops?? Im just over 35 weeks and for the past 2 days ive felt a lot more pressure when im standing/walking and my stomach doesnt feel quite as round and tight. But when i compair pics i took on tuesday vs ones from today, i can see im bigger but dont seem to be any lower.. ive felt since early on that im going to have her early and just trying to figure out if her dropping is all in my head or not..