if you use for 2 days youll probably get withdrawals, yes.
you need to take a month ideally, or even better: never again.
what youre attempting to justify here is where loads of people quitting heroin fail and relapse. you feel okay after withdrawal, but the heroin is still playing head-games with you; its very unlikely you'll stick to just using twice, and even if you do, youll most likely have more withdrawals.