Am i reallly pregnant?

Hey, I Just took a pregnancy test about three days ago at which point I got back two positive test. Me and my fiancé were over the moon excited. I have lower back pain, missed two periods, nauseated, extremely tired, and having weird dreams. My only worry is that the test I took was inaccurate and when I go tomorrow to see if I am truly pregnant, will show that I am not and its all some weird coincidence and I will feel like an idiot. I hope the forums about blue die pregnancy test are not true. Anyone else experience this?