Confused

Okay, so I know I ovulated about 8 or 9 days ago as I had ALL signs and symptoms like i do every month (horrible one sided cramps, fatigue, ewcm and of course blazing positive opk). Today I'm 8dpo, and got a positive opk, negative internet cheapie. Has anyone else had this happen?? Is it just a second surge that won't result in O? Side note: I know I'm not supposed to keep testing after a positive opk, but I'm on metformin and I'm trying to track my cycles as close as possible for my follow up appointment next month. Also maybe I'm a little nuts. Regardless, any insight is appreciated.