Am I supposed to do this ?

So I took a test this morning and I thought I saw a faint faint line .. But wasn't sure so I held the back of it up to a light and there was a pink line where to test line is . But it wasn't as visible without holding it to the light infact I could hardly see it (one of those that you question it's existence) I'm going to wait untill next Friday and retest that way there's no guessing game because AF is due next Friday and I'm 11dpo today . But with me seeing a line with it held to the light could that mean I'm preggo !? Or is there always a pink line there ..