negative pregnancy test, could I still be pregnant?

S90Hudd

I know you are not supposed to get discouraged after one month of trying, but it's hard not to. My husband and I tried on all my fertile days, and a couple days before and afterwards. I took a negative pregnancy test 4 days before my missed period with a pregnancy test that claims it can give accurate results 6 days before your missed period. I know there's a slight chance I still could be, is there anyone on this site who has taken a negative pregnancy test when you really were pregnant?