Is this a UTI or just a symptom of pregnancy?

I'm 27 weeks pregnant nd am urinating a lot. Let me rephrase...I feel like I have to urinate a lot and then when I get into the bathroom a lot of times just a tiny bit comes out. I would normally think something like that is a UTI, but I am pregnant for the first time and thought maybe it is one of those pregnancy things. (I call the dr constantly for every little thing that goes wrong, so I was hoping to have some kind of idea if this is normal before Icall and make an emergency appointment.) There is no discomfort, dryness, or anything like that, just running to the bathroom more than usual and not much is coming out.