Can I Get Pregnant Or Be Pregnant

If I’ve Had Positive opk Test For 4 Days Straight Could I Have A Chance Of Getting Pregnant ? I Keep Hearing About This Surge You Have Right Before Your Period is Due & Clearly Something is Going On. Can I Get Pregnant On That Surge Time Or is it Possible I’m Already Pregnant ..I Posted A Pic Of My opk Test. & I Recently Had A Miscarriage In May & I Had The Same On opk Test. So i Know They Can Pick Up pregnancy . Anyone???