Peeing when pregnant?

Samantha • First time mommy due with baby #1 September 2017
Stupid question but something I've been wondering the past couple of days. They say an early pregnancy symptom is having to pee a lot. Does this mean having the sensation to pee more than usual, or actually physically passing more urine than usual? 
I know later on it's because of baby pushing on the bladder, but what about earlier??

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