Positive opk day 7?!

Kelsie • Wife, Momma to 3 girls, expecting baby #4! 🤰
Okay so this is my first cycle after my miscarriage. Miscarriage last month on February 12. Started period a week after I finally got down to 0 hcg -- that was march 10. Period over and it's day 7. Took a clearblue digital opk yesterday and it showed low. Today I got a high fertility blinking smiley face! Is this possible? Should I trust it??