Those do sound like early pregnancy symptoms, and you are late on your cycle, which is promising. My only early symptoms really were feeling like my period would start any minute (period-like cramps) and pink/brown spotting the first week after my period was late. However, that infection you had could have delayed your ovulation, and if ovulation is late, your period can be late.
I would test again once your period gets to be a week late. Some women take awhile to build up HCG in their urine. Also, maybe try testing with an early results test (those are more sensitive and detect lower levels of HCG hormone) such as First Response Early Result or Answer Early. If you still have a negative test in a week and no period, go to the doctor and get a blood test done. That is the most definitive way to tell whether you are pregnant or not. Good luck!