Around 12 weeks or 12 weeks even?

I see people say that you CANNOT start showing before 12 weeks. And it is ONLY bloat. But why is 12 like this magic number that suddenly you're "allowed to pop" then. I mean everyone's body is different, no? I'm sure there is a small window in which it moves above the pubic bone.

Or is it like literal FACT. 12 weeks. Not before. Not even after. But sometime during the twelfth week that uterus is gonna move above the bone?

I like knowing the facts lol.

Because I'm only 8weeks, but closer to 6/7... so I cant expect to pop any sooner. I showed at 14 weeks with my first. I'm 105 lbs pre pregnancy, this time and last time. So I'll prob pop at 15 weeks again because I'm behind.

What a piss off. Sooner my ass lol.