I just read this and actually thought it made sense it was on a topic on why smu is better than fmu...
You last pee at 9pm on a day we'll call day 1.
You get up at 6am (day 2) and pee FMU 9 hours later.
That pee includes a 9 hour mix of pee with hCg from day 1 and day 2.
Two hours later, at 8am on day 2, you pee.
That pee is made up of only day 2 pee. If your hCg is doubling, it would be at a higher concentration on day 2 than on day 1. Plus, you haven't had anything to drink since prior to 9pm the night before, so it should be more concentrated pee in general, and have a higher hCg level due to the fact that it has only day 2 hCg and is not a mix of day 1 and day 2 hCg levels.
I found my smu much better than fmu and therefore i will be using my frer with smu lol x