Needing to pee but not always much there

H
Hi, I'm 9weeks pregnant and have irritable bladder on and off.
Yesterday I had the urge to pee loads more, every 20 minutes. My irritable bladder feels like a infection some times so I get tested if it plays up. Yesterday I took a sample in as it felt weird down there with the pressure of wanting to pee and back ache but, it was negative.
Is this normal ? I have seen some say it's due to the uterus? 
Please help, it's my first pregnancy so finding it all a bit worrying 😀

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