positive in the AM, negative in the afternoon?!

Hi everyone! Just as the title says - I had a positive pregnancy test this morning, very faint, but there was a LIGHT pink line with both my FMU/ SMU.

I took another test about 4hr later, after peeing a couple times, and it was stark white negative.

Could I be from too much water..?! Is it too soon? I’m only 9dpo at MOST.