If i smoked ice a couple of times a few weeks ago will that show up on a hair follicle test that i have three weeks from now?

Yes: the thing with hair testing is that any significant single use you have had during the period in which that hair has been growing will show an indication of that use when subjected to testing. Methamphetamine is a very very addictive drug (more so than cocaine or even heroin) and if you play with it, you are going to eventually get into trouble. Get some counseling now and admit the problem.