I actually read that on Carls guide. But for me the mail isn't much later. For example she moves in to her house on sunday at 8 am (fresh save). I make her apply for university in the first minute, and the next day at just past 8 the computer tells me the result.
Then at around 10ish or so the mail arrives. I waited for the mail a couple of times and only once it skipped a second day. The other times I just enrolled straight after checking at the laptop.
Offtopic, I did have triplets a number of times in my 100 baby challenge. I don't know what makes the scale tip though, there weren't even lot traits back then. You're bound to get them eventually. In TS3 it helps if you give the father the fertility trait too, but I don't know if the same goes for TS4.
