Morning pee?

I'm 4 days late now (๐Ÿ˜๐Ÿ™๐Ÿป๐Ÿ˜) and I'm ready to go pee on a stick! However I know it's best to use first morning urine..should I save some of that and then go buy tests? Of course I'm all out at the moment ๐Ÿ˜ฉ just wondering if I need to save some of that first morning urine for the most accurate result?! Tia.