It is probably not. :>)) What about post nasal drip? What were you cutting up? Did it have a strong odor (what you were cutting up)?
Anyway, if it happens again, I'd go to your doctor. It is really hard to tell spinal fluid from other fluid that might come out of your nose. But they can test it. A swab tells them. So, this would be worth doing if it happens again. Hang in there!