okay so I had unprotectedsex July 28th and my last period was July 10th I normally have a regular period butI got a UTI in August I went to the hospital August 13th they said that I was not pregnant and then a week later on the 20th I tested again from a home pregnancy test and got a negative now I'm still feeling abdominal pains a little back pains and I am having light blood every 2 days maybe I don't know if I could be pregnant and I'm just testing on the wrong days or if it is just a UTI messing my period up..i usually have breasts pains but im not..and i didnt have a period for august...Help me please!