More than one positive ovulation test?

Kayla • 27 year old social worker who can`t wait to have a family of her own!
So I'm on month 17 of trying, 3 months on metformin. 
My first question is can that make OPK's unreliable? We BD all the time so I'm more doing it to see if I'm even getting close to ovulation or if I should talk to my doctor about clomid. 
Here's my second question; I have a positive ovulation test on Monday: (the first picture) and then I took a test yesterday to see if my surge went down and it did. So I was like sweet maybe I ovulated! Fast forward to today, I took a test just out of curiousity, and it came out looking like this (second picture) which to me seams like a second positive. 
I'm wondering if it's the metformin that's throwing these off, or if I maybe ovulated twice, or if I'm just crazy and am seeing things!! 
Any input is appreciated!!! Thanks ladies!!