Well let me assure you that there is no chance that you can be pregnant. The reason being that you have had two normal periods since you had intercourse. If you were pregnant then you would have definitely missed your periods. If you are having periods, then there is absolutely no chance that you can be pregnant. Regarding the UTI, while it is true that pregnant women are more prone to getting a UTI, it is also true that women can get them frequently without being pregnant as well. Actually women are more prone to get UTI's than men.
If you do have symptoms of a UTI such as frequent urination, burning pain while urinating, lower abdominal pain, back pain, flank pain, increased urination or change in color of urine then you would need to get a urine routine examination done. You might also need to get a urine culture done as well. In addition, considering your crampy abdominal pain it might be wise that you get an abdomen and pelvis ultrasound done as well. This can determine if there is an infection in the bladder or if there is an abnormality in the reproductive tract. These cramps can be associated with the use of birth control however considering your other symptoms it would be wise to get this checked out by a OB/GYN who can also treat your UTI at the same time. While you get yourself checked out, it would be advisable to drink increased amounts of water.
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