Hi , hope this is the right place to post . I have a uti and been prescribed trimethoprim as the dates predicted 12 months . I had my dating scan today and it says i am only 9 weeks . Rang the midwife immediately and she said not to worry but ring doctors for other antibiotics. I took 3 days of 5 . Doctor seemed more concerned and wasn't very reassuring. I Googled it and have found some worrying results ( there are also some positive ones )can't help but stress . Did anyone else take them during the first trimester. Tia xxx