Ovulation tests

Lori

I just recently miscarried at 5w4d. My opk that I got my bfp from never turned as dark as the control. I use the internet cheapies and i have heard this with many other woman. I know I must have ovulated because I got pregnant 2 days after the test. Also I kept testing to make sure and the lh dropped back to negative. So does the surge show and drop before ovulation because I'm positive when I oed and test had already went back to negative by then

I also had lots of ewcm and was very "ready" lol... ideas ladies?