OPK; line help

Does your strip get lighter before getting darker?

Yesterday my test line was darker then it was today, but still not nearly as dark as the control line. That has never happened to me before. Usually the line intensity increases with each passing day until I get that Peak positive.

Top one is yesterday

This bottom one is today.

What do you all think? Normal and this line could get darker tomorrow and just continue testing for the sake of seeing what happens......