Omgosh Omgosh!!!!!

Sarah
How accurate are digital pregnancy test!? My period is due 10/12. I have been spotting for the last 5-6 days lite one day enough I used a light tampon. I took a pregnancy test thinking well period is due 3 days away if I am it should show. Well ladies this is what I got. 
Is there anyway it can be wrong!? I'm so excited yet scared. I would run to the store and grab 2/3 more to verify but I have my daughter and step daughter with me and my fiancée and I have not told them we want to give them a baby sibling. So nixes the idea of grabbing a test. Help me with accurousy of tests? Is it true you can't have a false positive?