if a game gets region locked while its in your inventory does that one in ur inv lock?

I don't quite understand the question, but I think the answer is no, it won't be locked.

i got it after reading it 4 times answer is no i think

It will be locked. Your only chance is if Steam will change product ID while adding lock. Example: XCOM - had no info about playing lock through preorder phase, and after release it was locked for a moment, but outcry unlocked preorder version and created new ID for russian Xcom.

If it's locked I think it should be visible in the description in your inventory somehow...

And if you try to redeem it and it is a no-go, I'm guessing a trip to the support section is the thing to do, since what you bought wasn't locked.