you could be pregnant because even if the 2nd line is faint its still positive. The one that is negative are you sure you didnt see a really faint line on it?Anyway if you want to be really sure get a blood test done
are you using testing with your first AM urine?
Just give it a few more days and go get another one..and honestly I bought dollar test w all mine and all came out correct. They all came back positive and I was preggo all times.