Crows as Omen or Sign?

Three crows flew over my car today. One quite low. So who knows. I will wait and see.
Last year a white dove flew very low right in front of my car (they are not natural in this area) and my sister died the next night so I do not ignore birds very much.

I love crows! they are amazing birds. they tend to be around me alot, i had one approach me at uni and demand some of my food (i gave him some)