two positives and a negative what is going on

Long story short I skipped a period last month. My period was due the 17th or the 25th of April. I was getting tired of the waiting game and finally decided to take a test. I took three today. Two of which were double lined and one was digital. Which said "not pregnant". What the hell is going on? I don't want to be pregnant. But I'm mature enough to handle it the right way. I just wanna know why it's doing this.