Line isn’getting darker? Chemical pregnancy / Diluted urine?

Amy

Top picture was approx 14 DPO (1st morning urine)

Bottom is today at 16DPO (however this wasn’t first morning urine)

The top test has gone a bit yellow but to me the line is the same or even lighter today 😔 can diluted urine cause this or should I prepare for the worst?

UPDATE - The next morning I’ve used FMU to take 3 tests. First response (same as below) has the faintest line now as does a strip test but a clearblue digital says ‘pregnant’…what does this mean 😩

Further update - started bleeding around 5 weeks pregnant so chemical MC it is 😩