Helpppp !

So i took an opk. I just bought one from the dollar tree just to see what would happen. My predicted ovulation was yesterday. Obviously this isnt positive, i knew it wouldnt be. I got off of nexplanon in July. Ive been ttc but haven't successfully yet. I know this takes time coming off of birth control. Ive had a period every month so i would say im pretty regular from coming off. My main question is, since i have a faint line would you say i atleast ovulate? Im worried that im not ovulating since coming off and maybe thats why i havent conceived.