Thanks for your question. It is important that you go back to your doctor and get treated for your UTI and/or other possible infections. UTI's can be treated whether you have conceived or not, in fact, many pregnant women happen to be more prone to UTI's so they take medication for it all the time. All you had to do at the time was tell the doctor that since you were afraid that you may have been pregnant, to please prescribe something that could be taken during pregnancy. If you have tested for pregnancy lately, then that is not an issue any more and the important thing now is to treat your UTI and perhaps also have your doc look into why you have not had a period in over two months.
Please update us on your status,