Fmu??

Anyone ever had an obvious bfn with fmu and then later that same day after holding urine, had a bfp? I am asking because I have been testing for the past 3 days in the am, with fmu. Always turns out to be bfn. But in the am I NEVER feel like I actually have to urinate. All my life I have never really been one to have to urinate right when i woke up. And technically overnight I have been "holding" my urine for however many hours I have been sleeping, but is it really considered holding it if I dont actually feel like I have to go? I feel like if I "hold" my urine for 4+ hours later in the day, after I actually feel like I have to go, it could possibly make a difference in the outcome of the test? Am I just pulling at straws here ladies? 😔