you should go as soon as possible to the doctors! dont wait 4 weeks. i find it crazy that you will wait that long with a urinary tract infection, those are very uncomfortable and painful. if you wait too long the urinary tract infection can turn into a bladder infection and even worse it can turn into a kidney infection after that. it can potentially endanger you and your baby. it can also cause you to go into labor early. a friend of mine got a UTI while she was pregnant and she didnt know she had one, she thought the discomfort was just part of pregnancy, but she started having cramps every now and then and had a lot of fluid leak out while she was at a store so she thought she was going into labor but she still had 6 weeks left to go, so they treated her at the hospital for the urinary tract infection and she was able to make it to her due date.