Opk and confusing results

Kate • Ttc 40 months <3 happily married 3 years together 7
So we've been ttc for 2.5 years just finished clomid on Saturday Aug 1st been doing opks twice,daily since Sunday the 2nd. My lines,were getting close to ovulation and things were looking good. Then 8/8 I tested and my test love disappeared like the control line is there but I never got an actual positive. Has this ever happened to anyone? I'm very confused.