question about fmu please help

Kandi • Mom to 3 beautiful girls. Expecting august 2020

I collected a sample of fmu in a cup this morning around 6 am but I didn't have a test at the time it was around 945 before I got a test is this urine still accurate. or did it need to be In a sealed container and put in a the fridge I left it sitting out in my bathroom and the heat was on in there. af was due yesterday but a no show but the test came up negative with that urine. just wandering if I done it wrong