I am 22, I have had 6 negative pregnancy tests in the last 2 months(3 home in October/2 at planned parenthood/1 at ER last week).
I was diagnosed Bacterial Vaginosis a week ago and am 19 days late for my period. I've had no nausea just a painful pinch frequently in my lower abdomen on the left side. Also my stomach has been bloating real bad and it feels inflated and I feel really gassy. People tell me that Im just experiencing pms symptoms for this whole time because of the infection and that I will start soon. WELL I just finished with the antibiotic "Bactrim" yesterday. Anything else needed to know just ask. I don't have insurance atm. I am sick of feeling like crap and always hungry.

It is possible the urine tests just haven't picked up a pregnancy yet. Not the norm, but possible.

It is also possible that this is just an off cycle and you will skip this period, even though your body may have been gearing up for it.

See what happens when your next period is due. If it too doesn't show, try another pregnancy test. If at all possible, see about having a blood test done for it.