Help with 5spd transmission, Weird noise Options

[CelicaGT04]

Ok guys here is the deal,

Sometimes when shifting from first to second or second to third,
(these are the only gears that this happens) it makes a weird
grind noise, like the clutch did not engage. It does this when i
1) shift to fast 2) mornings on cold start (this is sparse but i did
notice it still happens)

What do you guys think it could be?

Thanks,
Gt04