I am 3 days late for AF and i have been cramping like AF is coming and back has been hurting. So I decided to take a test i took this in the afternoon and after 2 to 3 minutes a line showed up so i took a picture. Then i went to get my significant other when we came back the line was gone. So i am so confused....Then i took one the next morning and nothing showed. Help Please has anyone else had this problem