I have every pee hour!!

I am almost 21 weeks with my first baby. I have always had a pretty weak or overactive bladder without really any exclamations from the doctors. I was actually going to go have a ultrasound just to double check everything before I found out I was pregnant. I now feel like I have to pee every 45 minutes to an hour. I go to the bathroom and it’s not usually very much. It doesn’t burn or anything and I don’t have a fever, I don’t have a urinary tract infection or kidney infection. I’m not diabetic either. Feeling the need to pee more often has gotten worse as I’ve gotten farther my pregnancy. Does anybody else have the same problem? I’m worried about maybe they’re being a cyst somewhere but I would think that they would be able to see it on an ultrasound for the baby. But maybe not? I am going to see my doctor on Wednesday so I will bring it up then but I was just curious if this is common for everyone else