Positive OPK after miscarriage-help!

Liz
Hey,
So I had a D&C just over a week ago after finding out that I had a missed miscarriage at 11weeks. 
I bought some OPK strips which just turned up today. I decided to do one just to see...the result is below...
From my understanding, the test line should be as dark as the control for it to be positive? So this is positive?? Is it possible this is a false positive due to me still having hcg in my system following my miscarriage???
I'm really confused! Help!!
Thank you!