One single use will probably cause some amount of light withdrawal, or maybe not because you weren't addicted very long. However, you're almost guaranteed to slip back into active addiction. I was addicted for 10 years, heavily, and withdrew many times fully, and always convinced myself I could use "just one day", and
every single time I ended up using daily again, not immediately but the one slip led to an increasing number of slips and I was back where I left off very quickly.
In fact, last summer I had been clean for 6 years, didn't even have cravings anymore. I was in a really 'trying time, and I had the chance to dose some morphine once. I just did it, told myself it was just that once. Actually had kind of a bad experience, I was way too high, spent the next day throwing up constantly. But sure enough, a month after that I did kratom. Started doing it more often, then switched to poppy tea again (what I used before I quit). Then got some suboxone. Spent 6 months chipping away, now I'm once again dealing with cravings and withdrawal. As an addict, you really can't use opiates without going back to where you don't want to be. Sad but true.
I REALLY fully believed I was no longer an opiate addict. I really didn't struggle with it anymore, it was in the past, I could have people using in front of me and offer me some and I had no problem with saying no, and it didn't make me crave it. But that one slip... I'm afraid I will always crave opiates now because the craving is back. I truly regret that slip, one of the big mistakes of my life.
The first time I relapsed like you're considering, the resulting addiction made the first time seem like nothing. It gets worse every time. It was about a year into my usage, I had quit for a 3 or 4 months and was feeling good. I think the next time I quit was a few years after that. Then I quit for 6 months and felt good again. Then I slipped again and entered the worst years of my life. I had a lot of short-term quits in there too but I quit 3 major times in my life. Even a 6 year period of no opiates didn't save me from slipping again, once I let myself do it that first time.
If you haven't done it yet, you could break what is likely to become an awful, soul-sucking cycle in your life. It will never be easier than it is right now.