First time OPK user 😂

Victoria🌻 #2 due April 2019✨

So this is my first time using opk's. I got the ones they have at dollar tree. I've taken 4 today with faint lines through out the day and I know that means negative. But this last 5th one I just took the line is fainter than the first 4. What does that mean ? If anything lol thanks for reading and lots of baby dust to all you beautiful ladies!! 💕