Can a OPK detect pregnancy?

Kristina • 22. Wife. Momma. 🌎💞
So today I am 4dpo. My cervix is still very high,closed, and soft. My CM is a milky color but it is very thin and feels like a silicone make up primer (if that makes sense). 
Just for fun, also since I only have one HPT right now, I used a First Response Ovulation Test and I got this. 
Now I know this it's not a "truly" positive OPK. But I see a faint line, and was wondering. Since I am 4dpo today, could a OPK detect that I am pregnant? Or is it too early?