Does your bladder shrink when pregnant?

I swear i have to pee like every 20 minutes and its usually 3 drops,. I mean seriously my bladder can't hold 3 drops? i feel like if I don't go i will pee my pants just to get up for 3 drops. i use to be able to hold my pee for hours now i can't hold 3 drops?
Update: I'm 16 weeks 4 days.. 4 months
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