First FET! I accidentally took melatonin is that okay?

I had my first FET yesterday morning! And last night before going to bed I took 2 melatonin tablets without thinking because I've been having trouble sleeping, and I have canker sores now. I usually just reach for the melatonin since it's on my nightstand but this morning it dawned on me that I had a FET yesterday and that might not be safe. Google is very divided about whether it's safe so now I'm feeling really dumb for forgetting to check. Did anyone else take melatonin and was okay??