Opk finally positive?!

Opinions please! I've been ttc for a little over 3 months now and never got a positive LH Test. Always just faint lines with carecheck brand. Frustrated I went online a couple days ago and saw reviews stating they didn't work and to use easy@home and the first test I take with this brand it's a positive. i still have a few carecheck opk so I took it and it's faint again! Has anybody used these brands?! Do you trust them? I'm on CD 13 and always start testing on CD 8.