OPK question???

So ttc#2 never used these with my first as I was lucky enough it happened straight away however adter ttc this time for a couple of months I thought I'd invest I some tests they are not the best just cheaply dip sticks.... Next month I shall be investing a little more and getting digital seriously u need a degree with these things!!!! Anyway my question is I am on day 14 and only getting a really faint second line could it be my positive will come without gradually getting darker or will I see changes in the shade as ovulation gets closer I have ewcm any help would be appreciated