really faint line- evap or positive?

[Maria B]

ok so i know you cant actually tell me if i am or not- im just wondering on experiences and advice...i took a test this morning with a first response test and i saw a very very very very faint 2nd line, (but i dont know if im just wishing that its ther) like i can see it but only when look carefully... i have never been pregnant before (me and hband are TTC) so im not sure what is classed as a positive, i think i am around 14dpo as my LH surge was on +OPK on wed 15th dec. so im wondering if you think i should wait a few days and test agin if AF doesnt show or if you think its just a n evap line and are these common- cz i didnt evenknow they existed until i looked on the net. I have a digital clearblue at home so maybe i should try that next time and then teh line decision is out of my hands? thanks x