Replying to Hair Drug Test coming up, HELP

So I've been absolutely freaking out. I'm a 21 y/o who just accepted his dream engineering internship. I just discovered that I have to take a hair follicle drug test prior to starting. I have no idea when the test is, could be next week, could be in 3 months. So heres the story:

I have never been a heavy smoker. I've probably smoked weed 20 times in my entire life. Recently, I haven't smoked in about 2 years. However, I had 2 hits off my buddies joint one night about 1.5 months ago. Didn't even get high. Should I be worried about this?

What I am more worried about, however, is the coke. I've done coke twice in my entire life. First time way about 8 months ago, second time was 2 bumps off the end of a knife about a month ago. Am I fucked?

Again, I am not a heavy drug user at all. Literally in the las 2 years I have had 2 hits off a joint and a couple bumps of coke. I am 5'10", good metabolism, probably 11% body fat, decently thick brown hair. Can you guys share some stores/advice you have for me? I'm losing sleep over this.