Pos OPK?

Is this positive or may be positive by tonight? Last cycle I got a positive on cd 13. I know to bd every other day but not sure if 4 days in a row is too much. The way I am thinking is if bd tonight and it turns positive tomorrow then I would need to bd tomorrow (+ opk), the day of actual ovulation and day after to be safe. Is that too much?  Sorry I am just trying to plan