If I smoke about a half a gram of weed 2 months will it show on my test , it was my first time ever smoking , I haven't smoked since , I need to know asap, they took the hair sample under my armpit , I haven't shave my armpit prob over a year ago

If they already took the hair sample why the need to know ASAP?

What happens, will happen. We can't accurately guess the outcome. You'll have to worry until you get the results. Hopefully that worry will teach you something.

Good luck.

A half a gram of marijuana isn't much. It also depends on how strong the marjuana was. If it had a high content of THC you might have some trouble passing a test. Also body grows a lot slower than head hear so the time frame is a lot longer, maybe between 6 and 12 months. But since you didn't smoke much I am going to go out on a limb and say your chance of being negative are good.