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? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors