Question about double XP

Okay guys, really sorry if this has already been answered, but here it is: Should I apply my codes BEFORE or AFTER I play my first Halo match? Because I have heard rumors and speculation that if you apply them before you lost them forever or something. I have about 23 matches so I just want to make sure what to do. Thanks.

This is not a 100% confirmed answer but I have heard someone say that he/she talked to a representative that said if you push ur matches to ur gamertag before you play halo 4 you should still be fine. I hope this is the case seeing as how i pushed 200 matches to my account already!

> This is not a 100% confirmed answer but I have heard someone say that he/she talked to a representative that said if you push ur matches to ur gamertag before you play halo 4 you should still be fine. I hope this is the case seeing as how i pushed 200 matches to my account already!

Ok, thank you.

they did this for MW3 last year and i never lost my XP