faint lines

So I've been in pain with my womb and back area and also got a weird discharge, I've decided to take a pregnancy test, straight away it turned negative, then 5 minutes later there's a slight smudge at the bottom and can see a very very very faint line. I can't take a photo of it because it's that faint but deffo one there. Positive or faulty? Clear blue. Oh and to add during my ovulating me and my partner had sex lots. Thank you for all help.