If you have had sex, you could be pregnant. I'm also sure many women have had urine tests come back negative.

It is possible you are but you know your period won't come out on the same exact day every month you have to give or take a few days....as far as urine tests...I swear I am the queen of false negatives. I took 4 or 5 home tests that all came back negative and then a blood test that came back negative low and behold a week after the last test I took a urine at the hospital and it was positive so when I take a test I don't just take one I usually take about 7 of them to be sure. When I found out I was pregnant I was already 11 weeks and I had been taking tests since I was 5 weeks...so there is your answer and you are not alone in that and it sucks...I used to not be that way I think it might have something to do with my fiance's levels maybe I don't know b/c I was prego by my ex and the positive came up right away, with my fiance I am never sure.