Bladder infection! Dilated 1cm!

So I had to take a trip to L&D lastnight for consistent painful contractions and before I was having some crazy cramps and just wasn't feeling well.  I'm also 33 weeks far as of today. Ended up calling the nurse and they told me to come in. I was downing water on the way over so once we got their the contractions were barely able to be picked up on the monitor. Nurse checked me and says I'm 1 cm dilated. So I gave a urine sample and waited and kept drinking lots of water. They came back and told me i was very dehydrated but not enough for an IV but close and that I need to take antibiotics because I have a bladder infection. Now I know the cause of the cramping. So finally we were able to go home at about 2am.