Peeing An Awful Lot!

Tiffy ā€¢ Gave birth to a beautiful baby girlšŸŒ·šŸ’•šŸŽ€šŸ’ Madisyn Mirai šŸ˜˜
I'm 13 wks 3 dys and I have to pee every 30 minutes to an hour. Why is this? I know the baby isn't big enough to cause pressure or is it?? I read so much but I don't get it, what causes a pregnant woman to have to pee soo much at 13 wks pregnant??? šŸ˜ž