None that I can think of to be honest. I'm not superstitious in any way!
I believe if 27 stupid people cross your path in a single day, bad luck is imminent. :)
I grew up with the old adage. Whistling girls and crowing hens, always come to a bad end. When I catch myself bragging, I stop immediately.
If I sneeze three times in a row, I'm 100% getting sick... though it's almost true, and not sure a superstition.