Does anyone know why results might be different at different times of day? For example, I tested this afternoon and got a positive, but then tested again in the evening and got a clearly negative result (line barely visible).

I’ve been testing since three days ago and the line has gotten progressively darker up until this afternoon’s test. No clue where I am in my cycle, as they’re beyond irregular (PCOS).

Help please, I’m so confused about how this works.