What is the significance of seeing two praying mantis together?

I'm not sure but I saw one on my doorstep today and my girlfriend saw one on the tire of her car an hour later. Neither of us have seen this creature in over twenty year or so. Mystics believe it is a sign of good luck, bad luck, a need for change or even a pregnancy in the household. So I don't know. Maybe they are just over-breeding. When I was a kid, it was illegal to kill one. Like, a $500 fine because of their asset to eradicating other evil insects and possibly felons of the neighborhood. I don't know but I think it's a good thing.