Do ability boost retroactively apply to HP / trained skills?

[Dire Ursus]

If at level 5 a character chose to boost their int would they gain a new trained skill? If they chose to boost con would they gain their level in total hp?

[Fourshadow]

Dire Ursus wrote:

If at level 5 a character chose to boost their int would they gain a new trained skill? If they chose to boost con would they gain their level in total hp?

That's how we have played it and the GM (one of my sons)is a stickler for the rules, so I'm pretty certain that is RAW & RAI.