Testing with OPKs and Clomid

Aurora

This is my first cycle using Clomid. Taken cd5-9. I started tested day 11. without medication, I ovulate cd18-19. At this point I’d usually start to see progressively darker lines until positives, but now they seem to be getting lighter if anything. Is this normal? I figured I would ovulate sooner with Clomid but maybe not?