Faint line that disappears after a few minutes

[Korri_lynn]

On April six when i was supposed to start my period I started spotting very very lightly....so light in fact i didnt even need a tampon. The color of the blood I was spotting was brown and I've been ttc for many months since my miscarriage in August after not knowing I had been pregnant, so I thought maybe it was implantation bleeding. So this morning I figured why not and took a pregnancy test. There was a very very faint positive but after a few minutes it disappeared. Any thoughts or advice on this.....anything would help!!