TMI question ?!

My first morning urine seems to be really diluted... not sure why ?! ... I don’t even drink any water at night during sleep and I pee just before going to sleep to make sure I don’t have to wake up again in the middle of the night.

I feel like this might be the reason for me to get negative pregnancy tests ... how can I make my urine more concentrated. Any tips or advice ?!

Sorry if this is a very awkward question... wasn’t sure where to post it ?!