Possible to give yourself uti by holding in pee?

Last night I kept having to pee over and over. I held it in once for a really long time like 3 hours. Got up and peed a ton. Then started having pressure / urge to pee sooo much. Sometimes a little comes out sometimes a lot. But the pressure has not gone away.

I’ve had utis before and they were more pain than pressure but just wondering what this could be. It’s annoying

34 weeks pregnant btw