 [ Symptoms ] could i be pregnant  i had sex with a friend 1 day before my fertile window my period ended may 13 and fertile window starts may 18 and i am three days late for my period and a took a pregnancy test and it was negative [ Disease ] did you add some tap water to your urine test to make it dilute or did you water load by drinking lots of water before being tested you will most likely be asked to provider another test