I 495 lvl but ı dont have a heirloom

Hi basit-huner  the award of shards upon the opening of 500 packs is automatic and it is often the case that players have not opened enough packs.

There are 3rd party sites that can give you a rough idea of where you are in the countdown to your heirloom, like the one below, which you could use

https://apexlegendsstatus.com/apex-pack-calculator

The new level cap in Apex Legends is effectively 2000. You can loop through levels 1-500 4 times.

The total number of packs you can now earn, through leveling up to 2000, is 544 packs. That is a guaranteed heirloom.

Fyi for heirloom purposes, Thematic packs are the same as Apex packs, they count towards the 500 pack heirloom guarantee, while Collection event packs are different, as they just count towards the collection event reward and not towards the heirloom gurantee.

Recently published Heirloom Shard drop rates indicate an actual drop rate percentage of 0.045%. 

https://answers.ea.com/t5/News-Game-Updates/Apex-Legends-Minimum-Global-Drop-Rates/m-p/14143089#M192

I collect my packs up and open them by the 100 and make a note, so I know exactly whete I am in the heirloom count. Coincidentally I just got a set of shards from a pack this week. It was pack number 495.