Test line not getting darker

Vicky
Heya girls!
So my period was due yesterday and on Monday and for some of yesterday I had dark pink brown spotting. I've been testing since 10dpo which started really faint and although they've got darker they aren't getting any darker on the last few days than the colour they are at. Had a chemical at the start of the year so I'm really nervous at these lines staying the same. I see ladies with there tests dark in a few days. Any advice?
10dpo friday
Sat and Sunday
Top Monday fmu second smu third today's smu

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