Are caterpillars lucky/benign or do they bring bad luck ?

I’m not usually supersticious but yesterday I woke up with the feeling something was crawling on my left arm. I held still and waited to make sure then I worked up the courage to look. When I saw it I freaked and shook it off. The second time I searched my bed thoroughly but found nothing. In the morning I woke up again to it crawling on my left finger. I googled this and found nothing useful.

I was wondering if it could be some kind of sign or omen… I should also mention I have severe juvenile arthritis and my left wrist is the most effected by this. Does anyone know if this is supposed to mean anything ?