Constant contractions @ 26 weeks

I’m 26 weeks and have been having contractions on and off for a few weeks now. Well, two mornings ago they woke me up at 5:30am and we’re very consistent. 3 minutes apart for almost two hours. The contractions last about a minute log each. I called my dr when they opened and they got me to come in to check my cervix length via u/s. It looked fine and I didn’t really get much of an answer. I’m still having them alot. They stopped being consistent for a bit but now there in full swing again. Plus, I’m needing to go pee every 10-15 minutes. The contractions are uncomfortable and some are a good bit painful. I have lower back pains with them. The dr didn’t seem to concerned and said some people just contract a lot but didn’t tell me much. What can I do? I’m drinking lots of water and staying off my feet a good bit but that doesn’t seem to help. I’m just trying to get baby girl to stay put for atleast a few more weeks