There's usually disagreement on the topic and I'm not sure if this is accurate at all, but I don't think it would set you back too much. I'd look at is a tapering dose.
If you had a 150mg habit where your body was adjusted to taking 150mg, this would be 10% of that daily total. Going with the 150mg habit example, if you had stayed on a consistent dose in the days prior to quitting, in the 3 days before you quit you would have consumed 450mg of oxy. If you quit for 3 days, you're at 0mgs where you would normally have consumed another 450mgs. It's a big drop. Taking a small dose may extend the process a few hours, but it might be less severe in the time following. Also, during the time that the oxy was effecting you there may have been a brief period of respite where you can regroup mentally.
I think it depends on your personality and what type of opiate you're using. I'd rather WD for 10 days, but not have it be as severe, where I can still function semi-normally as opposed to 4-5 painful days where I coudn't function normally.
Good luck with everything!
Do you know what type of drug test it is? Does oxycodone show up the standard 5 panel? If you consume a lot of fluids and sweat and urinate enough then you'll probably pass. That might be a low enough dose where it won't be a problem.