How recent (number of days) in relation to your test did you smoke? What sort of test was it (blood, urine, hair)? How much on a weekly basis would you say you smoke? Do you just get buzzed or do you get baked out of your goddamn mind when you smoke? What was your method of ingestion (smoke, vape, eat, dab, etc)? Are you fat?
Tons of variables and then there's the unknown variable of individual metabolism speed, which you will never know unless you ingest a specific amount of thc and do blood and urine drug testing to determine your body's clearance of the drug.
THC is highly lipophilic and distributes widely into fat, even more with repetitive use. This is why the positive testing window ranges from a couple days to well over a month.
Best advice: look up your employer's drug policy. If they accept any federal funding, they must have a drug policy that bans anything on schedule I substance list. Some employers have a zero tolerance policy, while others offer assistance with rehab and second chances if you admit to your faults. As painful as it may be to stomach, if you have to fake like you have a THC addiction to keep your job, it may be worth it. If you test positive, tell them the truth that you used it x amount of days ago on your day off and didn't think it would be a problem since it's legal. Play dumb. Unless you got tested because of a workplace accident; then you're fucked.
I wouldn't worry about OTC meds. They're legal. The only issue would be if you took a bunch of ibuprofen, naproxen, or a PPI such as prilosec or nexium or protonix before your test. NSAIDs and PPIs can cause a false positive for THC. This is problematic because drug testing occurs in two phases: immunoassay and gas chromatography/mass spectrometry (GC/MS) or liquid chromatography/tandem mass spectrometry (LC/MS/MS). Almost everyone uses immunoassay because it is cheaper. This is good because it is less sensitive for positive. If it's negative, then you're good to go. If it's positive, then the sample is further analyzed with more sensitive methods to rule out false positives. The issue is that these secondary analysis methods are much more sensitive and may show positive in a sample that you might have shown negative in the immunoassay. Nothing would suck more than having motrin cause a false positive only to test positive for carboxy thc on secondary analysis.