My last period started on august 18th. on the morning of the 22 i had sex and the condom broke so i immediately got next choice. A week later i experienced light spotting. Now it is September 21, I have no period yet and I was just diagnosed with a UTI.I took a pregnancy test at the doctors office but it was negative. I am afraid it might have been a false negative because i was not able to urinate much. Could the stress of school and not knowing whats wrong with me delay my period? Also could my UTI antibiotics delay my period? When should i take another pregnancy test