fmu is not concentrated

Hello beautiful ladies I A question for you guys so I've known that I am pregnant for the last for five days and I have been taking some test to see if the line is getting darker what I have noticed is in the mornings it's superlight and in the evenings it's very dark this for example is the picture of last night and this morning last night is very dark in this morning is very light.... this happened a few days ago to evening urine was extremely concentrated and my first morning urine left a very light have you guys ever experienced this before????