Could I still be pregnant

With my first pregnancy a had a positive pregnancy test four days before a missed period well I took the same kind of test that I did with my first pregnancy today and it was negative im supposed to start tomorrow i have no signs of starting the last two days I have been so sleepy i have had cramping and I don't cramp when I start the only time when I cramp was when I was pregnant with my first baby I am starting to lose hope I used the First Signal Dollar Store test